The Move to Global War
Part I: Peacemaking and Collective Security (1918--1935)
The Treaty of Versailles (28 June 1919)
The Treaty of Versailles was the most consequential of the Paris Peace Conference settlements, and its perceived injustices became a central grievance driving German revisionism throughout the interwar period.
Key Terms
Territorial losses: Germany lost approximately 13% of its European territory and roughly 10% of its population. Alsace-Lorraine was returned to France; the Eupen-Malmédy district went to Belgium; northern Schleswig voted to join Denmark after a plebiscite; West Prussia and Posen were ceded to the newly reconstituted Poland, creating the Polish Corridor that separated East Prussia from the German heartland; the Saarland was placed under League of Nations administration for 15 years, with France controlling the coal mines; and all German colonies were transferred to League of Nations mandates under British, French, Japanese, and South African administration.
Military restrictions: The German army (the Reichswehr) was limited to 100,000 men, including no more than 4,000 officers. Conscription was abolished. The navy was restricted to 15,000 men, six battleships, six light cruisers, twelve destroyers, and twelve torpedo boats. Submarines, military aircraft, tanks, and heavy artillery were entirely prohibited. The Rhineland was to be permanently demilitarised, and Allied forces were to occupy the left bank of the Rhine and bridgeheads for 15 years.
War guilt and reparations: Article 231 of the Treaty, the so-called "war guilt clause," compelled Germany and its allies to accept "the responsibility of Germany and her allies for all the loss and damage" suffered by the Allied powers. This clause provided the legal and moral basis for reparations, the exact amount of which was not fixed at Versailles but was determined by the Reparations Commission in May 1921 at 132 billion gold marks (approximately $33 billion), payable in annual instalments of 2 billion gold marks plus 26% of the value of German exports.
The German Reaction and the Dolchstosslegende
The German government signed under protest. The treaty was presented to the German public as a
Diktat -- an imposed settlement to which they had no meaningful input. The Weimar political
establishment that accepted the treaty -- particularly Matthias Erzberger, who signed the Armistice,
and Philipp Scheidemann, who resigned from the cabinet rather than sign -- was subjected to a
campaign of vilification.
The most pernicious myth to emerge was the Dolchstosslegende ("stab-in-the-back" legend),
propagated by right-wing nationalists such as General Erich Ludendorff and subsequently adopted by
the Nazi Party. This narrative held that the German army had not been defeated on the battlefield
but had been betrayed on the home front by socialists, Jews, and democratic politicians. It was
historically baseless -- by late 1918 the German army was in full retreat, the Allies had broken
through at Amiens, and the German High Command itself had urged an armistice -- but it was
politically devastating, undermining the legitimacy of the Weimar Republic from its inception and
providing fertile ground for extremist movements.
The League of Nations
Structure and Covenant
The League of Nations was established under Part I of the Treaty of Versailles, with its Covenant forming the first 26 articles. The principal organs were:
The Assembly: Met annually in Geneva. Each member state had one vote, regardless of size. The Assembly could only make decisions unanimously on non-procedural matters, which severely limited its capacity for decisive action.
The Council: Met more frequently (initially four times a year, later quarterly). It comprised permanent members (initially Britain, France, Italy, and Japan; Germany was added in 1926) and non-permanent members elected by the Assembly. Unanimity was again required for substantive decisions, with the notable exception that a party to a dispute could not vote on a resolution concerning that dispute.
The Permanent Secretariat: Based in Geneva and headed by a Secretary-General, it provided administrative continuity and managed the League's day-to-day operations.
The Permanent Court of International Justice: Located at The Hague, it adjudicated disputes between states and provided advisory opinions. However, participation was not compulsory -- states could accept the Court's jurisdiction selectively.
Strengths and Weaknesses
Strengths: The League established a framework for collective security that was unprecedented in scope. Its specialised agencies -- the International Labour Organisation (which survives to this day as a UN agency), the Health Organisation, the Refugee Commission (led by Fridtjof Nansen), and the Mandates Commission -- achieved genuine successes. The ILO established conventions on working hours, child labour, and workplace safety. The Health Organisation coordinated the response to epidemics. Nansen's Refugee Commission issued the "Nansen passport," which provided legal identity to hundreds of thousands of stateless persons, particularly Armenians and Russians displaced by revolution and war.
Weaknesses: Three structural deficiencies were fatal. First, the absence of the United States, which never ratified the Treaty of Versailles despite President Woodrow Wilson's pivotal role in drafting the Covenant, deprived the League of the world's largest economy and potentially its most powerful military guarantor. Second, the unanimity requirement in both the Assembly and the Council meant that any great power could veto collective action against itself or its allies. Third, the League possessed no independent military force and relied entirely on the willingness of member states to enforce its resolutions through economic sanctions or military action -- willingness that proved conspicuously absent when tested.
League Failures
The Manchurian Crisis (1931--1933)
On 18 September 1931, elements of the Japanese Kwantung Army detonated explosives on the South Manchurian Railway near Mukden and blamed Chinese nationalists, using the incident as a pretext to seize the entirety of Manchuria. The Chinese government appealed to the League of Nations under Article 11 of the Covenant.
The League's response was characterised by delay and indecision. The Council passed a resolution on 24 September calling for Japanese withdrawal, which Japan ignored. The League appointed the Lytton Commission (headed by Lord Lytton of Britain) to investigate; the Commission did not arrive in Manchuria until April 1932 and did not report until October 1932. The Lytton Report, published in October 1932, concluded that Japan's actions could not be justified as self-defence, that Manchukuo was not a genuine independent state, and that Japan should withdraw to the railway zone. Japan rejected the report and, on 27 March 1933, announced its withdrawal from the League of Nations -- the first major power to do so.
The League imposed no meaningful sanctions. An economic embargo would have been crippling to Japan, which depended on imported oil, steel, and scrap iron, but Britain and France were unwilling to risk confrontation with a major power, particularly given their preoccupation with the European economic crisis. The United States, not being a League member, issued the Stimson Doctrine (January 1932) declaring that it would not recognise territorial changes effected by force, but this was a purely moral position with no enforcement mechanism.
The Manchurian crisis established a pattern that would repeat throughout the 1930s: aggressor states could defy the League with impunity because the great powers were unwilling to commit the resources necessary to enforce collective security.
The Abyssinian Crisis (1935--1936)
Italy under Mussolini had long coveted Abyssinia (Ethiopia), one of only two independent African states. The pretext for invasion came on 5 December 1934 at Wal Wal, where Italian and Ethiopian forces clashed along the ill-defined border between Italian Somaliland and Abyssinia. Mussolini demanded an apology and compensation; Emperor Haile Selassie appealed to the League.
The League's response was, if anything, even more damaging to its credibility than its handling of Manchuria. The Council condemned Italy as an aggressor on 11 October 1935 and imposed economic sanctions, but these were deliberately weakened: oil, steel, coal, iron, and other strategic materials were excluded from the sanctions list, meaning Italy could continue to wage war. The Suez Canal remained open to Italian shipping, allowing the transport of troops and supplies to East Africa. Britain and France, the two powers best positioned to enforce sanctions through their control of Mediterranean sea lanes, were reluctant to antagonise Mussolini, whom they hoped to keep as a counterweight to Nazi Germany.
The Hoare-Laval Pact (December 1935), secretly negotiated between British Foreign Secretary Samuel Hoare and French Prime Minister Pierre Laval, proposed to grant Italy large portions of Abyssinia in exchange for a nominal cessation of hostilities. When details were leaked to the press, the public outcry forced Hoare's resignation and the collapse of the agreement, but the damage was done: the pact revealed that the League's leading members were prepared to sacrifice Abyssinian sovereignty rather than confront Mussolini.
Italy completed its conquest in May 1936. League sanctions were lifted on 4 July 1936. The Abyssinian crisis was the death blow to collective security: it demonstrated that the League would not protect a member state that was the victim of aggression by a great power, and it drove Mussolini into closer alignment with Hitler.
Washington Naval Conference (1921--1922)
Convened by US President Warren G. Harding, the Washington Naval Conference was the first major international disarmament effort of the interwar period. It resulted in three principal treaties:
The Five-Power Treaty (6 February 1922): Britain, the United States, Japan, France, and Italy agreed to a ratio of capital ship tonnage of 5:5:3:1.75:1.75. This was a significant concession by Britain, which abandoned its traditional "two-power standard" (maintaining a navy larger than those of the next two largest powers combined). The treaty also imposed a ten-year moratorium on the construction of new capital ships.
The Four-Power Treaty (13 December 1921): Britain, the United States, Japan, and France agreed to respect each other's Pacific territories and to consult in the event of disputes. This effectively replaced the Anglo-Japanese Alliance of 1902, which had been a source of concern for the United States.
The Nine-Power Treaty (6 February 1922): All nine participants affirmed the sovereignty, independence, and territorial integrity of China and endorsed the Open Door Policy. This was entirely aspirational and unenforceable, as subsequent events would demonstrate.
The Washington Naval Conference was a genuine achievement in that it produced verifiable, quantitative limits on naval armaments, but it was limited in scope (covering only capital ships, not cruisers, destroyers, submarines, or aircraft carriers) and did not address land armaments at all.
The Locarno Treaties (October 1925)
Negotiated at Locarno, Switzerland, the treaties were widely hailed as having inaugurated a new era of European reconciliation -- Gustav Stresemann called them "the real beginning of the reconciliation of the peoples." The principal agreements were:
The Rhineland Pact: Germany, France, and Belgium mutually guaranteed the inviolability of their common borders as established at Versailles. Britain and Italy acted as guarantors. Germany also accepted the demilitarised status of the Rhineland. Crucially, Germany did not guarantee its eastern borders with Poland and Czechoslovakia -- this asymmetry was a deliberate choice by Stresemann, who maintained that the eastern borders were provisional and subject to revision.
Arbitration treaties: Germany concluded arbitration treaties with France, Belgium, Poland, and Czechoslovakia, committing all parties to submit disputes to binding arbitration.
The Locarno Treaties facilitated Germany's admission to the League of Nations in September 1926 and contributed to the optimistic atmosphere of the mid-1920s. However, the failure to guarantee Germany's eastern borders left Poland and Czechoslovakia feeling exposed and undermined the principle of the indivisibility of peace -- if some borders were more negotiable than others, the entire system of collective security was weaker than it appeared.
The Kellogg-Briand Pact (27 August 1928)
Originally proposed by French Foreign Minister Aristide Briand as a bilateral Franco-American treaty renouncing war, the initiative was expanded by US Secretary of State Frank B. Kellogg into a multilateral agreement. The Pact of Paris (as it was formally known) was ultimately signed by 65 nations. It condemned "recourse to war for the solution of international controversies" and renounced war "as an instrument of national policy."
The Pact was widely ridiculed even at the time. It contained no enforcement mechanism, no definition of what constituted "war" versus "police action" or "self-defence," and no provisions for sanctions against violators. It was, in essence, a statement of aspiration rather than a binding legal constraint. Its significance lies primarily in its influence on post-war international law -- the Nuremberg Tribunal would later cite it as evidence that aggressive war was illegal under international law, a precedent that informed the United Nations Charter's prohibition on the use of force.
Part II: Rise of Authoritarian Regimes
Mussolini and Italian Fascism
The Seizure of Power
Benito Mussolini, a former socialist journalist and veteran of World War I, founded the Fasci di
Combattimento in March 1919. The movement drew support from war veterans, nationalists, and
landowners alarmed by the spread of socialist agitation. The squadristi -- Fascist paramilitary
units -- conducted a campaign of violence against socialist organisations, trade unions, and
left-wing newspapers, burning the offices of the socialist newspaper Avanti! and attacking
socialist and Catholic labour headquarters.
The March on Rome (27--29 October 1922) was a deliberately theatrical gesture. Approximately 30,000 Blackshirts converged on Rome, but the Italian army remained loyal to the state and could easily have dispersed them. King Victor Emmanuel III, fearing civil war and lacking confidence in the Liberal government of Luigi Facta, refused to sign a decree of martial law and instead appointed Mussolini as Prime Minister on 29 October 1922. Mussolini arrived in Rome by sleeper train, not at the head of his followers.
The Corporate State
Between 1925 and 1927, Mussolini dismantled the remaining democratic institutions and established a one-party dictatorship. The Acerbo Law (November 1923) guaranteed a two-thirds parliamentary majority to any party winning the largest share of votes in a general election, provided that share exceeded 25%. The Matteotti Crisis of 1924 -- the murder of socialist deputy Giacomo Matteotti by Fascist thugs -- briefly threatened Mussolini's position, but his speech of 3 January 1925, in which he assumed personal responsibility for the actions of the squadristi and challenged the opposition to remove him, marked the beginning of the overt dictatorship.
The corporate state, formally established by the Charter of Labour (1927) and the Law on Collective Bargaining (1926), organised the economy into 22 corporations, each representing employers and employees in a specific sector of the economy. Strikes and lockouts were forbidden. In practice, the corporations were instruments of state and party control: employers dominated them, and they served to suppress independent working-class organisation rather than to mediate between labour and capital. The system never functioned as Mussolini claimed; it was an ideological construct masking the reality of authoritarian control.
Totalitarian Methods
Mussolini's regime employed the full apparatus of totalitarian control: press censorship, abolition of opposition parties, suppression of trade unions, creation of a secret police (the OVRA), and the establishment of youth organisations (the Opera Nazionale Balilla) designed to inculcate Fascist values. The Lateran Treaties of 1929, which resolved the "Roman Question" by recognising Vatican City as an independent state and establishing Catholicism as the state religion, were a significant achievement that enhanced the regime's domestic legitimacy and removed a potential source of opposition.
Mussolini's totalitarianism was, however, less systematic and less effective than Hitler's. The Italian state bureaucracy was never fully purged of non-Fascists; the monarchy, the army, and the Church retained significant independent power; and the regime's ideological coherence was questionable -- Fascism was more a collection of slogans and rituals than a coherent political philosophy.
Hitler and Nazism
The Beer Hall Putsch and Mein Kampf
Adolf Hitler's first attempt to seize power, the Beer Hall Putsch of 8--9 November 1923, was an almost comically amateurish affair. Inspired by Mussolini's March on Rome, Hitler and his supporters -- including Erich Ludendorff, Ernst Röhm, and Rudolf Hess -- seized the Burgerbräukeller in Munich, declared the government deposed, and attempted to march on the Bavarian War Ministry. The march was dispersed by Bavarian police; 16 Nazis and four police officers were killed. Hitler was tried for treason, convicted, and sentenced to five years' imprisonment, of which he served only nine months.
The trial was a political triumph for Hitler. He used the proceedings as a platform to denounce the
Weimar Republic and the Versailles settlement, and the sympathetic Bavarian judiciary allowed him to
speak at length. During his imprisonment at Landsberg Prison, Hitler dictated Mein Kampf ("My
Struggle") to Rudolf Hess. The work, published in two volumes (1925 and 1926), combined
autobiographical narrative with a virulently anti-Semitic worldview, a crude theory of racial
hierarchy, and a programme for German expansion eastward (Lebensraum). It was not widely read
during the 1920s -- the first edition sold fewer than 10,000 copies -- but it became the canonical
text of the Nazi movement and provides essential evidence of Hitler's long-term intentions.
The SA, the SS, and the Road to Power
The Sturmabteilung (SA, or Stormtroopers), led by Ernst Röhm, were the Nazi Party's paramilitary
organisation, numbering approximately 400,000 by 1932. The Schutzstaffel (SS), initially
established as Hitler's personal bodyguard under Heinrich Himmler, was a smaller but increasingly
important elite force that would become the principal instrument of Nazi terror.
Hitler's appointment as Chancellor on 30 January 1933 was the result of political miscalculation by
conservative elites -- particularly President Paul von Hindenburg and Chancellor Franz von Papen --
who believed they could control Hitler and use his popular support to advance their own agenda. The
Reichstag Fire (27 February 1933), whether set by Marinus van der Lubbe alone or with Nazi
complicity, provided the pretext for the Reichstag Fire Decree (28 February), which suspended civil
liberties. The Enabling Act (23 March 1933) granted Hitler the power to legislate by decree,
effectively establishing the legal dictatorship. The Night of the Long Knives (30 June--1 July 1934)
eliminated the SA as a potential rival when Röhm and approximately 200 others were murdered, and
Hindenburg's death on 2 August 1934 allowed Hitler to combine the offices of Chancellor and
President as Führer und Reichskanzler.
Nazi Ideology and the Legal Road to Power
The Nazi seizure of power is remarkable for the extent to which it was accomplished within a legal framework. Unlike Mussolini, who seized power through the threat of armed insurrection and subsequently dismantled democratic institutions, Hitler was appointed Chancellor through constitutional processes and then used the existing legal system -- the Reichstag Fire Decree and the Enabling Act -- to dismantle democracy. This "legal revolution" meant that the Nazi dictatorship derived its formal legitimacy from parliamentary acts, a fact that complicates assessments of resistance and collaboration.
Stalin and Soviet Communism
Consolidation of Power
Joseph Stalin's rise to absolute power was the product of bureaucratic manipulation rather than revolutionary charisma. Following Lenin's death in January 1924, Stalin outmanoeuvred his rivals -- Leon Trotsky, Lev Kamenev, and Grigory Zinoviev -- through his control of the party apparatus as General Secretary. By 1928, Stalin had eliminated all significant opposition within the Communist Party.
The First Five-Year Plan (1928--1932) marked a decisive break with the mixed economy of the New
Economic Policy (NEP). It set ambitious targets for industrial output -- heavy industry was to be
prioritised at the expense of consumer goods -- and collectivised agriculture by force. The kulaks
(relatively prosperous peasants) were identified as class enemies and subjected to "dekulakisation":
deportation, imprisonment, or execution. The human cost was staggering: the famine of 1932--1933,
concentrated in Ukraine (the Holodomor), killed an estimated 3.5 to 5 million people.
The Second Five-Year Plan (1933--1937) continued the emphasis on heavy industry while slightly improving consumer goods output. The Third Five-Year Plan (1938--1942) was disrupted by the German invasion in 1941.
The Great Purge (1936--1938)
The Great Purge, or Yezhovshchina (named after NKVD chief Nikolai Yezhov), was the most extensive
episode of political repression in Soviet history. Three Moscow Show Trials (1936--1938) provided
the public spectacle: Zinoviev and Kamenev were tried and executed in August 1936; a second trial of
leading Bolsheviks, including Karl Radek, took place in January 1937; and the third trial, of
Nikolai Bukharin, Alexei Rykov, and the Red Army commander Mikhail Tukhachevsky, occurred in
March 1938.
Beyond the show trials, the purges swept through every level of Soviet society. The Red Army was particularly devastated: approximately 90% of generals and 80% of colonels were removed, many executed, including Marshal Tukhachevsky, the USSR's most capable military strategist. The NKVD, the secret police, was itself purged in 1938--1939 when Yezhov was replaced by Lavrentiy Beria. Estimates of the total death toll of the purges range from 1 to 2 million, with millions more sent to the Gulag.
The consequences for Soviet military preparedness were catastrophic. The officer corps that would face the German invasion in 1941 was largely inexperienced, and the purges eliminated the very commanders who might have organised a more effective defence.
The Command Economy
The Soviet command economy achieved extraordinary industrial growth -- Soviet industrial output increased by approximately 300% between 1928 and 1940 -- but at enormous human cost. Living standards for most Soviet citizens declined or stagnated. The emphasis on heavy industry and military production created an economy capable of producing tanks and aircraft in vast quantities but unable to feed its own population adequately. The system was fundamentally inefficient: central planning could not match market mechanisms in allocating resources, and the absence of price signals led to chronic misallocation, waste, and shortages.
Militarism in Japan
The Manchurian Incident and the Greater East Asia Co-Prosperity Sphere
Japan's imperial expansion was driven by a combination of economic necessity (Japan lacked the raw materials -- oil, rubber, iron ore, and coal -- necessary for industrial development), strategic insecurity (the United States and Britain controlled the sea lanes upon which Japan depended), and ideological conviction (the belief that Japan had a civilising mission in Asia and a right -- even a duty -- to lead Asia against Western imperialism).
The Kwantung Army's seizure of Manchuria in 1931 established the puppet state of Manchukuo, nominally ruled by the last Qing emperor, Puyi. Japan withdrew from the League of Nations in 1933 rather than accept the Lytton Commission's findings. The full-scale invasion of China, launched on 7 July 1937 after the Marco Polo Bridge incident, resulted in the occupation of much of eastern China, including Nanjing, where Japanese forces committed the Nanjing Massacre (December 1937--January 1938), in which an estimated 200,000 to 300,000 Chinese civilians and disarmed combatants were killed.
The concept of the Greater East Asia Co-Prosperity Sphere, formally proclaimed in 1940, was the ideological framework for Japanese expansion. It promised liberation from Western colonialism and economic cooperation among Asian nations under Japanese leadership. In practice, it meant the exploitation of occupied territories for Japanese benefit and the imposition of harsh military rule.
Political Structure
The Japanese political system in the 1930s was characterised by the increasing dominance of the
military over civilian government. The Imperial Japanese Army and Navy operated with considerable
independence, and military officers routinely intervened in politics through assassination,
intimidation, and the exploitation of the emperor's constitutional prerogatives. Prime Minister
Inukai Tsuyoshi was assassinated by naval officers in May 1932. The military's autonomy --
"independent command" (tokusō ken), which placed operational decisions beyond cabinet control --
meant that civilian politicians could not restrain military adventurism even when they wished to do
so.
Part III: Causes of the Second World War
The Treaty of Versailles as a Cause
The Orthodox View
The orthodox interpretation, dominant from 1919 through the 1930s, held that Germany bore primary responsibility for the war and that the Treaty of Versailles was a just, if imperfect, settlement. This view was articulated by the Allied leaders themselves and by historians such as Sidney Fay, who, while critical of specific provisions, argued that the treaty's fundamental structure was defensible. From this perspective, the causes of the Second World War lay in German revanchism and the failure of the democracies to enforce the treaty.
The Revisionist View
Revisionist historians, particularly in the 1920s and 1930s, challenged the orthodox interpretation.
In the United States, historians such as Harry Elmer Barnes argued that the Versailles settlement
was excessively punitive and that Allied war guilt was equal to or greater than Germany's. In
Britain, economists such as John Maynard Keynes (in The Economic Consequences of the Peace, 1919)
argued that the reparations burden was economically impossible and politically destabilising. The
revisionist position held that the treaty itself was a major cause of the Second World War because
it created the conditions -- economic hardship, national humiliation, and territorial grievance --
that made German revanchism inevitable.
Assessment
The debate is now largely resolved in a middle position. The treaty was neither as punitive as its German critics claimed (the actual reparations burden was manageable and was effectively cancelled by the Lausanne Conference of 1932) nor as lenient as Keynes argued. The German economy recovered strongly in the mid-1920s, and it was the Great Depression, not Versailles, that created the political crisis that brought Hitler to power. Nevertheless, the treaty's symbolic significance -- the humiliation of a proud nation, the war guilt clause, the perceived violation of the principle of national self-determination -- was a genuine factor in creating the political climate in which Hitler's message resonated.
The Failure of the League of Nations
The League's failure to prevent the Manchurian and Abyssinian crises demonstrated that collective security was unworkable without the commitment of the great powers. The League's structural weaknesses -- the absence of the United States, the unanimity requirement, the lack of an independent military force -- were compounded by the political unwillingness of Britain and France to risk war in defence of a principle. The League was further weakened by the departure of Germany (October 1933) and Japan (March 1933), and by the ineffectiveness of the Disarmament Conference (1932--1934), which collapsed when Germany walked out after the other powers refused to grant it parity in armaments.
The League's last significant action was the imposition of sanctions on Italy over Abyssinia; their manifest inadequacy convinced the remaining member states that the League could not be relied upon for security. From 1936 onward, states pursued bilateral security arrangements -- the Anglo-German Naval Agreement (June 1935), the Franco-Soviet Treaty (May 1935), and ultimately the Molotov-Ribbentrop Pact -- rather than relying on collective security.
The Policy of Appeasement
Rationale
Appeasement -- the policy of making concessions to an aggressor in order to avoid war -- was the dominant British (and to a lesser extent French) diplomatic approach to Nazi Germany from 1935 to 1939. Its advocates advanced several arguments:
Britain was militarily unprepared for a major European war. The Ten-Year Rule (adopted in 1919 and only formally abandoned in 1932) had assumed that Britain would not be involved in a major war for a decade, leading to chronic underfunding of the armed forces. Rearmament had only begun in earnest in the mid-1930s, and senior military advisers -- particularly the Chiefs of Staff -- warned that Britain was not in a position to fight Germany effectively until at least 1939 or 1940.
The Versailles settlement was widely regarded as having been unduly harsh. There was a genuine, if naive, belief that if Germany's "legitimate grievances" were addressed, Hitler would be satisfied and the peace of Europe could be maintained. This belief was reinforced by Hitler's repeated assurances that he sought only peaceful revision of the treaty.
The memory of the First World War was overwhelming. The Somme, Passchendaele, and the staggering casualty figures of 1914--1918 had created a deep and understandable reluctance to contemplate another European conflict. The Oxford Union debate of 9 February 1933, in which the motion "This House will under no circumstances fight for its King and Country" was carried by 275 votes to 153, was emblematic of this pacifist sentiment.
The threat of communism was considered greater than the threat of Nazism. Many British conservatives viewed Hitler as a bulwark against Soviet communism and were more alarmed by Stalin's purges and the Spanish Civil War than by German rearmament.
Key Events
Remilitarisation of the Rhineland (7 March 1936): Hitler ordered German troops into the demilitarised Rhineland, in direct violation of both the Treaty of Versailles and the Locarno Treaties. The German force was small (approximately 19 infantry battalions) and under orders to withdraw if confronted. The French, however, were unwilling to act without British support, and the British government -- led by Stanley Baldwin -- concluded that Germany was "only going into her own back garden." The remilitarisation was a strategic disaster for France: the loss of the Rhineland as a buffer meant that France could no longer use it as a base for an offensive into Germany in the event of war, and the Siegfried Line (the German defensive fortification system) could now be extended along the German-Belgian border.
The Anschluss with Austria (12--13 March 1938): The annexation of Austria was explicitly prohibited by the Treaty of Versailles and was a long-standing Nazi objective. Schuschnigg, the Austrian Chancellor, attempted to forestall the Anschluss by proposing a plebiscite on Austrian independence. Hitler, fearing a defeat, ordered the invasion. German troops entered Austria on 12 March to a rapturous reception; the Anschluss was proclaimed the following day. Britain and France protested but took no action.
The Munich Agreement (29--30 September 1938): The Sudetenland crisis was the climax of appeasement. The Sudetenland, a region of Czechoslovakia with a predominantly ethnic German population, became Hitler's next target after the Anschluss. Henlein, the leader of the Sudeten German Party (acting under Berlin's instructions), made escalating demands for autonomy that the Czechoslovak government could not accept without dismantling the state.
The Munich Agreement, negotiated by Hitler, Mussolini, Chamberlain, and Daladier, granted the Sudetenland to Germany. Czechoslovakia was not invited to the conference and was compelled to accept the decision. Chamberlain returned to London declaring that he had secured "peace for our time." The Munich Agreement is now widely regarded as a catastrophic error: Czechoslovakia lost its defensive fortifications, industrial resources (including the Skoda armaments works), and strategic depth, making it indefensible. The Soviet Union, which had offered to support Czechoslovakia if France honoured its alliance obligation, was excluded from the negotiations entirely, reinforcing Stalin's suspicion that the Western powers were colluding with Hitler against the USSR.
Six months later, on 15 March 1939, Germany occupied the remainder of Czechoslovakia in violation of the Munich Agreement, converting Bohemia and Moravia into a "protectorate" and establishing a puppet state in Slovakia. This act of outright aggression finally convinced the British and French governments that appeasement had failed, and they issued guarantees to Poland, Romania, Greece, and Turkey.
Critics of Appeasement
Winston Churchill was the most prominent critic of appeasement, arguing consistently from 1933 onward that Hitler could not be appeased and that rearmament was essential. Churchill's position was vindicated by events, though his contemporaries regarded him as a warmonger. Historians have debated whether Churchill's alternative policy -- a firm stand against Hitler from 1936 -- would have prevented war. It is possible that a firm Anglo-French response to the remilitarisation of the Rhineland might have triggered a military coup against Hitler, but this is speculative.
The Nazi-Soviet Non-Aggression Pact (23 August 1939)
The Molotov-Ribbentrop Pact was one of the most consequential diplomatic agreements of the twentieth century. Publicly, it was a simple non-aggression treaty between Germany and the Soviet Union, each party promising not to attack the other for a period of ten years. Secretly, it contained a protocol dividing Eastern Europe into German and Soviet spheres of influence: Germany was to dominate western Poland, Lithuania was to fall within the German sphere, and the Soviet Union was to receive eastern Poland, Finland, Estonia, Latvia, and Bessarabia.
The pact was a product of mutual cynicism. Hitler needed Soviet neutrality to avoid a two-front war during the invasion of Poland. Stalin, having been excluded from the Munich negotiations and disillusioned with collective security, sought to gain territory and time to prepare for the war he believed was inevitable. The pact also included substantial economic provisions: the Soviet Union agreed to supply Germany with oil, grain, and raw materials in exchange for German manufactured goods and technology.
The German invasion of Poland on 1 September 1939, followed by the Soviet invasion on 17 September, completed the partition agreed at Moscow. Britain and France declared war on Germany on 3 September but did not declare war on the Soviet Union, which was technically complying with the terms of its agreement with Germany. The Soviet Union subsequently annexed the Baltic states, seized Bessarabia from Romania, and attacked Finland in the Winter War (November 1939--March 1940), for which it was expelled from the League of Nations.
Japanese Expansionism
Japanese expansion in Asia followed a different trajectory from German expansion in Europe but was no less destabilising to the international order. The occupation of Manchuria (1931), the invasion of China (1937), and the occupation of French Indochina (September 1940) brought Japan into increasing conflict with the Western powers, particularly the United States.
The American response was a series of escalating economic sanctions, culminating in the freezing of Japanese assets (July 1941) and a total embargo on oil exports (August 1941). Japan imported approximately 80% of its oil from the United States; the embargo threatened to cripple the Japanese military within months. The Japanese government faced a stark choice: withdraw from China and accept American demands, or seize the oil resources of the Dutch East Indies by force. The decision to pursue the latter course led directly to the attack on Pearl Harbor.
Economic Factors: The Great Depression
The Great Depression, triggered by the Wall Street Crash of October 1929, was a critical catalyst of the political crises that led to war. Its effects were global:
Germany: Industrial output fell by approximately 40% between 1929 and 1932. Unemployment peaked at approximately 6 million (nearly 30% of the workforce). The banking system collapsed in 1931. The Bruning government's deflationary policies deepened the crisis. The Nazi Party's vote share increased from 2.6% in 1928 to 37.3% in July 1932, making it the largest party in the Reichstag. Without the Depression, it is unlikely that Hitler would have come to power.
Japan: The collapse of export markets devastated the Japanese silk industry, which employed approximately 2 million households. Rural poverty became acute. The political crisis contributed to the increasing influence of the military and the abandonment of cooperative diplomacy in favour of expansionism.
Protectionism: The international economic system fragmented as states erected tariff barriers and imposed import quotas. The Smoot-Hawley Tariff Act (1930) in the United States provoked retaliatory tariffs worldwide, accelerating the collapse of international trade. Economic nationalism reinforced political nationalism and undermined the cooperative internationalism that the League of Nations represented.
Autarky: Both Germany and Japan pursued policies of economic self-sufficiency (autarky). The
Nazi Four-Year Plan (1936) aimed to make Germany independent of imported raw materials through
synthetic substitutes (ersatz materials) and the development of domestic sources. Japan sought to
create a self-sufficient economic bloc in East Asia. Autarky was both a response to economic
vulnerability and a justification for territorial expansion.
Part IV: Course of the Second World War (1939--1945)
Blitzkrieg in Europe
Poland (September 1939)
The German invasion of Poland employed the tactics that would become known as Blitzkrieg
("lightning war"): combined-arms operations integrating tanks, motorised infantry, and close air
support to achieve rapid breakthroughs and encirclements. The Polish army, though courageous, was
catastrophically outmatched: Poland had approximately 1 million men under arms against Germany's 1.5
million, with negligible armoured forces and an obsolete air force. Warsaw fell on 27 September; the
last Polish forces surrendered on 6 October. The Soviet invasion from the east on 17 September
sealed Poland's fate.
Scandinavia (April--June 1940)
Hitler invaded Denmark and Norway on 9 April 1940. Denmark was occupied within hours. Norway,
defended by British, French, and Polish forces as well as Norwegian troops, held out until June. The
Norwegian campaign demonstrated the effectiveness of German airpower and the vulnerability of naval
forces to air attack -- the sinking of the British carrier HMS Glorious by the German battleships
Scharnhorst and Gneisenau was a notable incident.
The strategic rationale for the Norwegian invasion was primarily economic: Germany depended on Swedish iron ore, which was shipped through the Norwegian port of Narvik during the winter months when the Gulf of Bothnia froze.
Western Europe and the Fall of France (May--June 1940)
The German offensive in the west, launched on 10 May 1940, was a masterpiece of operational planning. The main thrust came not through Belgium (where the Allies expected it) but through the Ardennes, a region of dense forest considered impassable by large armoured formations. General Heinz Guderian's XIX Panzer Corps crossed the Meuse at Sedan on 13 May, broke through the French defensive line, and raced to the English Channel, reaching Abbeville on 20 May and trapping the Allied armies in Belgium and northern France.
The Dunkirk evacuation (Operation Dynamo, 27 May--4 June) rescued approximately 338,000 British and French troops, but virtually all heavy equipment was abandoned. France capitulated on 22 June 1940. The armistice divided France into an occupied zone in the north and west (administered by Germany) and an unoccupied zone in the south (administered by the collaborationist Vichy regime of Marshal Philippe Pétain). The fall of France in six weeks was the most stunning military victory in modern European history and a catastrophic failure of Allied planning and intelligence.
The Battle of Britain (July--October 1940)
With France defeated, Hitler turned to the air assault on Britain as a prelude to invasion
(Operation Sea Lion). The Luftwaffe, commanded by Hermann Göring, initially targeted RAF airfields
and radar installations (the Kanalkampf phase, July--August; the main assault, August--September).
The RAF, commanded by Air Chief Marshal Hugh Dowding, employed an integrated air defence system
centred on the Chain Home radar network, which provided early warning of incoming raids, and the
Dowding System of fighter control, which allowed fighters to be scrambled efficiently to intercept
approaching bombers.
The critical turning point came on 7 September 1940, when the Luftwaffe shifted from targeting RAF
airfields to bombing London (the Blitz). This tactical error allowed the RAF to recover from the
brink of defeat. The RAF inflicted unsustainable losses on the Luftwaffe: in September 1940 alone,
the Germans lost approximately 400 aircraft. By the end of October, Hitler had postponed Operation
Sea Lion indefinitely.
The Battle of Britain was the first major defeat suffered by Nazi Germany and demonstrated that airpower alone could not compel a determined opponent to surrender. It also had profound political consequences: it ensured that Britain remained in the war, providing a base for the eventual liberation of Western Europe and the strategic bombing campaign against Germany.
Operation Barbarossa (22 June 1941)
The German invasion of the Soviet Union, codenamed Operation Barbarossa, was the largest military operation in history. It involved approximately 3.8 million Axis troops, 3,350 tanks, 2,770 aircraft, and 7,200 artillery pieces along a front extending from the Baltic to the Black Sea. The Soviet forces, despite numbering approximately 4.5 million, were poorly deployed and inadequately prepared: Stalin had ignored warnings of the impending attack from multiple intelligence sources, including his own spy Richard Sorge in Tokyo and the British Ultra decrypts.
The initial phase was a disaster for the Soviet Union. By December 1941, German forces had captured approximately 3 million Soviet prisoners, destroyed thousands of tanks and aircraft, and advanced to the outskirts of Moscow. However, the German advance was delayed by the stubborn Soviet defence of key cities (Kiev, Smolensk, and above all Leningrad, which endured a 900-day siege from September 1941 to January 1944), by supply difficulties caused by the vast distances and primitive Soviet infrastructure, and by the onset of the Russian winter.
The Soviet counteroffensive before Moscow, launched on 5 December 1941, pushed the Germans back 100--250 kilometres and saved the Soviet capital. It demonstrated that the German army was not invincible and marked the failure of Barbarossa's strategic objective -- the destruction of the Soviet Union in a single campaign. The Soviet Union would absorb the vast majority of the German military effort for the remainder of the war; it is estimated that approximately 80% of German combat casualties were inflicted on the Eastern Front.
Pearl Harbor and the Pacific War
The Japanese attack on the US Pacific Fleet at Pearl Harbor, Hawaii, on 7 December 1941, was a tactical triumph and a strategic catastrophe. The attack, launched from six aircraft carriers under the command of Admiral Yamamoto Isoroku, destroyed or damaged eight American battleships (including the Arizona, which sank with 1,177 crew) and damaged or destroyed approximately 200 aircraft. However, the American aircraft carriers -- Enterprise, Lexington, and Saratoga -- were at sea and survived. More importantly, the attack galvanised American public opinion: the isolationist movement evaporated overnight, and the United States committed itself to total war.
The Japanese simultaneous offensives in December 1941 seized the Philippines, Malaya, Singapore, the Dutch East Indies, Hong Kong, and Burma with astonishing speed. The fall of Singapore (15 February 1942), in which approximately 85,000 British, Indian, and Australian troops surrendered to a smaller Japanese force, was the worst defeat in British military history.
Turning Points: 1942--1943
The Battle of Stalingrad (August 1942--February 1943)
The Battle of Stalingrad was the decisive battle of the Eastern Front and arguably of the entire war. Hitler ordered the capture of Stalingrad (now Volgograd) both for its strategic position on the Volga River and for its symbolic value as a city named after the Soviet leader. The German Sixth Army, commanded by General Friedrich Paulus, fought its way into the city centre in brutal street-to-street combat against the Soviet 62nd Army under General Vasily Chuikov.
The Soviet counteroffensive, Operation Uranus, launched on 19 November 1942, encircled the Sixth Army and its allied Romanian and Italian forces. Hitler refused to allow a breakout, and a German relief operation (Operation Winter Storm) failed to reach the encircled forces. Paulus surrendered on 31 January 1943; the last elements of the Sixth Army capitulated on 2 February. Of the approximately 300,000 Axis soldiers trapped in Stalingrad, only about 90,000 survived to be taken prisoner, of whom only approximately 5,000 ever returned to Germany. Total Axis casualties (including Romanian, Italian, and Hungarian forces) in the Stalingrad campaign exceeded 800,000.
Stalingrad marked the irreversible shift of strategic initiative on the Eastern Front to the Soviet Union. From this point, Germany was on the defensive in the east.
The Battle of Midway (4--7 June 1942)
The Battle of Midway was the turning point of the Pacific War. The United States Navy, having broken the Japanese naval code (JN-25), was able to ambush the Japanese fleet commanded by Admiral Yamamoto. The Japanese objective was to seize Midway Atoll and draw the American carriers into a decisive battle.
The battle was decided in a matter of minutes. American dive bombers from the carriers Enterprise, Yorktown, and Hornet caught the Japanese carriers Akagi, Kaga, Soryu, and Hiryu while their aircraft were on deck being refuelled and rearmed. All four carriers were sunk -- a loss from which the Japanese navy never recovered. The Yorktown was sunk by a Japanese submarine on 6 June.
Midway was not merely a tactical victory; it fundamentally altered the strategic balance in the Pacific. Japan, which had entered the war with a significant carrier advantage (six fleet carriers to America's three), now faced a severe deficit. The initiative passed permanently to the United States, which launched the island-hopping campaign that would carry American forces across the Pacific to the Japanese home islands.
The Battle of El Alamein (October--November 1942)
The Battle of El Alamein in Egypt was the first major Allied land victory of the war. General Bernard Montgomery's Eighth Army, reinforced with substantial American equipment under the Lend-Lease programme, defeated General Erwin Rommel's Panzerarmee Afrika in a carefully prepared offensive that began on 23 October 1942. Montgomery's strategy was methodical rather than brilliant: he concentrated overwhelming force, maintained a clear line of attack, and refused to be drawn into premature offensive action.
Rommel, short of fuel and ammunition and lacking air support, attempted a breakout on 2--3 November but was repulsed. The Axis forces in North Africa, approximately 250,000 men, were ultimately trapped between Montgomery's advancing Eighth Army and the Anglo-American forces that had landed in Morocco and Algeria under Operation Torch (8 November 1942). The surrender of Axis forces in Tunisia in May 1943 eliminated the Axis presence in North Africa and opened the Mediterranean for Allied shipping.
D-Day and the Liberation of Western Europe
Operation Overlord, the Allied invasion of Normandy, was launched on 6 June 1944. It was the largest amphibious invasion in history, involving approximately 156,000 troops landed on the first day across five beaches (Utah, Omaha, Gold, Juno, and Sword), supported by approximately 5,000 ships and 11,000 aircraft. The invasion was preceded by an elaborate deception operation (Operation Bodyguard) designed to convince the Germans that the main landing would occur at Pas de Calais rather than Normandy.
The success of D-Day depended on several factors: Allied air superiority (the Luftwaffe mustered fewer than 200 sorties over Normandy on 6 June, against approximately 14,000 Allied sorties); the failure of the German response (Rommel was absent, and Hitler initially refused to release Panzer reserves); the effectiveness of the airborne operations that secured the flanks of the invasion beaches; and the courage of the infantry, particularly on Omaha Beach, where American casualties were the heaviest.
The breakout from Normandy (Operation Cobra, 25--31 July 1944) allowed Allied forces to sweep across France and liberate Paris on 25 August 1944. The Allied advance continued into the Low Countries and Germany, though it was slowed by the German counteroffensive in the Ardennes (the Battle of the Bulge, December 1944--January 1945), the last major German offensive of the war in the west.
The Defeat of Germany and Japan
The final defeat of Germany was achieved by the convergence of the Western Allied advance from the west and the Soviet advance from the east. The Soviet offensive of January--April 1945, culminating in the Battle of Berlin (16 April--2 May 1945), was characterised by enormous casualties on both sides. Hitler committed suicide in his bunker on 30 April 1945; Germany surrendered unconditionally on 8 May 1945 (V-E Day).
The defeat of Japan was precipitated by a combination of factors: the American island-hopping campaign, which brought B-29 bombers within range of the Japanese home islands; the strategic bombing campaign, which destroyed Japanese cities (the firebombing of Tokyo on 9--10 March 1945 killed an estimated 100,000 people); the naval blockade, which strangled the Japanese economy; and the Soviet declaration of war and invasion of Manchuria on 8 August 1945.
The atomic bombings of Hiroshima (6 August 1945) and Nagasaki (9 August 1945) remain the subject of
intense historical debate. The orthodox view holds that the bombings were necessary to compel
Japan's surrender without the need for a costly invasion of the home islands (Operation Downfall,
projected to cause up to 1 million Allied casualties and millions of Japanese deaths). Revisionist
historians, beginning with Gar Alperovitz in the 1960s, have argued that Japan was already seeking
to surrender through Soviet mediation and that the bombings were primarily intended to intimidate
the Soviet Union. The ongoing debate reflects the complexity of the decision and the impossibility
of knowing with certainty what would have happened in the absence of the bombings. Japan surrendered
on 15 August 1945 (V-J Day); the formal surrender ceremony took place aboard the USS Missouri on 2
September 1945.
Part V: Historiography of the Causes of the Second World War
Orthodox Interpretation
The orthodox interpretation, dominant from the 1940s through the 1950s, held that the Second World
War was the direct and inevitable consequence of Hitler's deliberate plan for aggressive war. This
view was articulated by historians such as Alan Bullock (Hitler: A Study in Tyranny, 1952),
Gerhard Weinberg (The Foreign Policy of Hitler's Germany, 1970), and Hugh Trevor-Roper
(The Last Days of Hitler, 1947). According to this interpretation, Hitler's intentions, clearly
stated in Mein Kampf and in his Second Book (written in 1928 but not published until 1961), were
the driving force of events: he sought Lebensraum in the east, the destruction of the Versailles
settlement, the subjugation of France, and ultimately a war of racial annihilation against the
"Jewish-Bolshevik" conspiracy. The war was not an accident or a product of structural forces but the
realisation of a coherent ideological programme.
The orthodox interpretation draws heavily on Hitler's own statements and on the
Hossbach Memorandum (5 November 1937), a record of a meeting at which Hitler told his military
commanders that Germany's future could only be secured through the conquest of Austria and
Czechoslovakia and the eventual acquisition of Lebensraum in Eastern Europe, at the latest by
1943--1945.
Revisionist Interpretation
Revisionist historians challenged the orthodox view by emphasising structural factors and policy
failures rather than Hitler's personal agency. The most prominent and controversial revisionist was
AJP Taylor, whose The Origins of the Second World War (1961) provoked a storm of criticism that in
many ways defined the subsequent historiographical debate.
Taylor's central arguments were:
Hitler was not a conventional statesman with a plan for war but an opportunist who exploited the mistakes and weaknesses of others. His foreign policy aims, Taylor argued, were essentially those of any conventional German nationalist -- the revision of Versailles, the incorporation of Austria and the Sudeten Germans into the Reich -- and were not fundamentally different from the aims of Stresemann or Brüning.
The outbreak of war in September 1939 was the result of diplomatic accident and miscalculation rather than deliberate planning. Britain and France, by issuing the guarantee to Poland, created a situation in which a German-Polish dispute over Danzig (a city that was, in Taylor's view, a legitimate German grievance) escalated into a general European war. The war was not "Hitler's war" in the sense that he willed it; it was a conventional diplomatic crisis that spiralled out of control.
The Versailles settlement was deeply flawed and created the conditions for conflict. Taylor argued that the peacemakers of 1919 bore significant responsibility for the Second World War because they created an inherently unstable international order.
Taylor's critics -- including Hugh Trevor-Roper, who described the book as "a travesty" -- argued
that Taylor systematically underestimated the radicalism of Hitler's intentions, downplayed or
ignored the evidence of Hitler's explicit war aims (particularly the Hossbach Memorandum), and was
guilty of a moral obtuseness in treating Hitler as a conventional politician. The controversy over
Taylor's book remains one of the most significant debates in modern historical scholarship.
Post-Revisionist Interpretation
Post-revisionist historians, writing from the 1970s onward, have sought to synthesise elements of
both the orthodox and revisionist positions. Key figures include Ian Kershaw
(Hitler 1889--1936: Hubris and Hitler 1936--1945: Nemesis), Richard Overy
(The Origins of the Second World War, 2009), and Timothy Mason.
Kershaw's concept of "working towards the Führer" is particularly important. Kershaw argues that while Hitler did not issue detailed plans for every aspect of policy, his ideological objectives were clear and well understood by his subordinates, who competed to anticipate and fulfil his wishes. This created a dynamic of "cumulative radicalisation" in which the regime became progressively more extreme without requiring direct orders from Hitler.
Mason's concept of "social imperialism" offers a structuralist perspective: he argues that the Nazi regime's drive to war was driven in part by domestic economic contradictions -- the Four-Year Plan created economic strains that could only be resolved through external conquest. Mason's thesis has been criticised for underestimating the role of ideology, but it usefully highlights the interaction between domestic and foreign policy.
Overy's synthesis emphasises that the causes of the war were multi-causal: Hitler's ideological objectives were a necessary but not sufficient condition. The war also resulted from the failure of the international system (the collapse of collective security, the inadequacy of appeasement), economic crisis (the Depression), and the specific diplomatic choices made by all parties.
AJP Taylor's Controversial Arguments in Detail
Taylor's work deserves extended consideration because of its influence and its methodological implications. Several of Taylor's arguments have stood the test of scholarship better than others:
Taylor was correct that Hitler's foreign policy in the 1930s was opportunistic in its timing and methods. Hitler did not have a fixed timetable for war, and he was prepared to postpone action when circumstances were unfavourable (as in 1938, when the Munich Agreement gave him the Sudetenland without a fight).
Taylor was also correct that the British and French governments bore significant responsibility for the failure to prevent war. The policy of appeasement was not simply cowardice; it reflected genuine structural constraints (military unpreparedness, public opinion, economic crisis) and a sincere, if misguided, belief that negotiated concessions could satisfy German grievances.
However, Taylor's minimisation of Hitler's ideological radicalism has not withstood scrutiny. The
evidence from Mein Kampf, the Second Book, the Hossbach Memorandum, and Hitler's numerous
speeches and conversations makes clear that his aims went far beyond conventional revision of
Versailles. The concept of Lebensraum implied the conquest, colonisation, and racial reordering of
Eastern Europe -- a programme that could only be achieved through war. Taylor's treatment of this
evidence was selective and at times disingenuous.
Part VI: Consequences of the Second World War
Human Cost
The human cost of the Second World War was unprecedented in scale. Total military and civilian deaths are estimated at 70 to 85 million, approximately 3% of the world's population. The Soviet Union suffered the heaviest losses: approximately 27 million dead, including approximately 11 million military deaths and 16 million civilian deaths. China suffered approximately 15 million deaths. Germany lost approximately 7 to 9 million, including approximately 4.3 million military deaths. Poland lost approximately 6 million, including approximately 3 million Polish Jews. Japan lost approximately 2.5 to 3.1 million.
The Holocaust
The Holocaust -- the systematic, state-sponsored genocide of approximately 6 million European Jews
by Nazi Germany and its collaborators -- was the most extreme manifestation of Nazi racial ideology.
The genocide was carried out through a combination of mass shootings (primarily by the
Einsatzgruppen in the occupied Soviet Union, which killed approximately 1.5 million Jews), death
camps (primarily Auschwitz-Birkenau, Treblinka, Belzec, Sobibor, and Chelmno, which used gas
chambers to kill approximately 3 million Jews), and the general conditions of ghettoisation, forced
labour, starvation, and disease.
The Holocaust evolved through several phases: the pre-war persecution of German Jews (the Nuremberg Laws of 1935, Kristallnacht in November 1938), the wartime ghettoisation of Polish and other European Jews, the mass shootings in the Soviet Union following the invasion of June 1941, and the implementation of the "Final Solution" (the systematic extermination of all European Jews) from mid-1941 onward. The Wannsee Conference (20 January 1942) coordinated the implementation of the Final Solution but did not initiate it; the decision to exterminate European Jewry was taken by Hitler and Himmler in the second half of 1941.
The Holocaust was not a spontaneous outbreak of violence but a bureaucratically organised, industrialised process of mass murder. It was made possible by the complicity or acquiescence of a broad range of actors: the German civil service, the military, industry (which profited from forced labour), and the populations of occupied territories, many of which collaborated in the identification and deportation of Jews. The question of why the Holocaust occurred -- why a modern, industrialised state devoted its resources to the systematic extermination of an entire people -- remains one of the most profound and disturbing questions in historical scholarship.
Displacement
The war produced the largest population displacement in modern history. Approximately 60 million Europeans were displaced, including approximately 11 million forced labourers in Germany, millions of refugees from eastern Europe, and the survivors of the concentration camps. The post-war period saw massive population transfers: approximately 12 million ethnic Germans were expelled from eastern Europe (primarily from Poland, Czechoslovakia, and Hungary), one of the largest forced migrations in history. The establishment of the United Nations Relief and Rehabilitation Administration (UNRRA) and subsequently the International Refugee Organisation (IRO) addressed the immediate crisis, but the legacy of displacement contributed to the creation of Israel (1948) and to ongoing political tensions in the Middle East.
The Formation of the United Nations
The United Nations was established by the San Francisco Conference (April--June 1945), which adopted the UN Charter on 26 June 1945. The UN was designed to address the structural weaknesses of the League of Nations: the Security Council, with five permanent members (the United States, the Soviet Union, Britain, France, and China) possessing the power of veto, ensured the participation of the great powers that had been absent from the League. The General Assembly, in which all member states were represented, provided a forum for international debate. The International Court of Justice continued the work of the Permanent Court of International Justice.
The UN Charter's prohibition on the use of force (Article 2(4)) and the recognition of the right of individual or collective self-defence (Article 51) established the legal framework for the post-war international order. The Universal Declaration of Human Rights (1948), drafted under the chairmanship of Eleanor Roosevelt, represented a watershed in the recognition of individual rights under international law, directly influenced by the atrocities of the war and the Holocaust.
The UN's effectiveness, like that of the League, has been constrained by the national interests of its great-power members, particularly during the Cold War. However, its specialised agencies (UNICEF, UNESCO, WHO, the World Bank, and the IMF) have achieved significant successes, and the UN has provided an indispensable framework for international diplomacy.
The Beginning of the Cold War
The Second World War destroyed the old European-centred international order and created a bipolar world dominated by two superpowers: the United States and the Soviet Union. The ideological gulf between American liberal capitalism and Soviet communism, the mutual suspicion generated by the wartime alliance (the delay in opening the Second Front, the Soviet domination of Eastern Europe), and the emergence of nuclear weapons as the ultimate instrument of military power all contributed to the onset of the Cold War.
Key early Cold War events included the Truman Doctrine (March 1947), which committed the United States to supporting "free peoples" resisting communist subjugation; the Marshall Plan (June 1947), which provided massive economic assistance to Western Europe; the Soviet blockade of Berlin (June 1948--May 1949) and the Allied airlift; the formation of NATO (April 1949); the Soviet atomic bomb (August 1949); and the communist victory in China (October 1949).
The Cold War would dominate international relations for the next four decades, shaping conflicts in Korea, Vietnam, the Middle East, Africa, and Latin America, and bringing the world to the brink of nuclear annihilation during the Cuban Missile Crisis of October 1962.
Decolonisation
The Second World War accelerated the disintegration of the European colonial empires. Several factors contributed:
The war shattered the myth of European invincibility. The rapid Japanese conquest of British, French, and Dutch colonies in Southeast Asia demonstrated that European powers could be defeated by non-European states. The surrender of approximately 85,000 British and Commonwealth troops at Singapore -- the "Gibraltar of the East" -- was a particular blow to British prestige.
The war depleted the economic and military resources of the colonial powers. Britain emerged from the war heavily indebted and unable to maintain its empire by force. The Labour government elected in 1945, preoccupied with domestic reconstruction, pursued a deliberate policy of decolonisation in South Asia: India and Pakistan achieved independence in August 1947, Ceylon (Sri Lanka) in 1948, and Burma in 1948.
The war strengthened nationalist movements in the colonies. Colonial troops who had fought for the Allies -- approximately 2.5 million from India alone -- returned with heightened political consciousness and diminished respect for colonial authority. The Atlantic Charter (August 1941), in which Roosevelt and Churchill affirmed "the right of all peoples to choose the form of government under which they will live," raised expectations that proved difficult to contain.
The superpowers, particularly the United States and the Soviet Union, were broadly hostile to colonialism (the United States for ideological and commercial reasons, the Soviet Union because colonialism was a target of communist critique), and the creation of the United Nations provided a platform for anti-colonial advocacy.
The process of decolonisation was uneven and often violent: India achieved independence through negotiation, but the partition caused massive communal violence; the French fought losing wars in Indochina (1946--1954) and Algeria (1954--1962); the Dutch attempted and failed to reassert control over Indonesia (1945--1949); and Britain confronted insurgencies in Malaya (1948--1960) and Kenya (1952--1960).
The Nuremberg Trials
The Nuremberg Trials (1945--1946) were an unprecedented exercise in international criminal justice. The International Military Tribunal, established by the London Agreement of 8 August 1945, tried 24 major Nazi war criminals on four counts: crimes against peace (waging aggressive war), war crimes (violations of the laws of war), crimes against humanity (murder, extermination, enslavement, deportation, and other inhumane acts committed against civilian populations), and conspiracy to commit these crimes.
The trials established several important legal precedents. The concept of "crimes against humanity" -- acts committed against civilian populations regardless of whether they violated the domestic law of the country where they were committed -- was a genuinely novel legal innovation. The principle that individuals, including heads of state, could be held criminally responsible under international law for acts committed in their official capacity was equally significant. The defence of "following orders" was rejected as a complete defence, though it could be considered in mitigation.
Of the 24 defendants, 12 were sentenced to death (including Hermann Göring, who committed suicide before execution; Joachim von Ribbentrop; Wilhelm Keitel; Ernst Kaltenbrunner; Alfred Rosenberg; Hans Frank; Wilhelm Frick; Julius Streicher; Fritz Sauckel; Alfred Jodl; Arthur Seyss-Inquart; and Martin Bormann, who was tried in absentia). Three were acquitted. Seven received prison sentences ranging from 10 years to life.
The Nuremberg Trials were not without criticism. The prosecution was accused of applying
ex post facto law (aggressive war had not been a crime under international law before the London
Agreement, though the Kellogg-Briand Pact provided a partial basis). The Soviet judges were
complicit in crimes of their own, notably the Katyn Massacre, and the presence of Soviet judges on
the tribunal was deeply ironic. The defendants were selected from among the defeated, and the
Allies' own actions (the strategic bombing of civilian targets, the atomic bombings) were not
subject to judicial scrutiny.
Nevertheless, the Nuremberg Trials established the foundational principles of modern international criminal law. The Genocide Convention (1948) defined genocide as acts "committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group." The Universal Declaration of Human Rights (1948) affirmed the inherent dignity and equal rights of all human beings. These instruments, and the tribunals that followed (the International Criminal Tribunal for the former Yugoslavia, the International Criminal Tribunal for Rwanda, the International Criminal Court), are the direct institutional descendants of Nuremberg.
Key Historiographical Terms for IB Examinations
| Term | Description |
|---|---|
| Orthodox | Hitler deliberately planned war; his ideology drove events |
| Revisionist | Structural factors and Allied policy failures were primary causes |
| Post-revisionist | Multi-causal synthesis; interplay of ideology and circumstance |
| Intentionalist | Hitler had a long-term plan (Mein Kampf as blueprint) |
| Structuralist/Functionalist | The regime radicalised through bureaucratic competition and circumstance |
Cumulative radicalisation | Kershaw's concept of subordinates "working towards the Führer" |
Social imperialism | Mason's thesis that domestic economic pressures drove expansion |
Dolchstosslegende | The "stab-in-the-back" myth used to undermine the Weimar Republic |
Key Dates
| Date | Event |
|---|---|
| 28 June 1919 | Treaty of Versailles signed |
| January 1920 | League of Nations holds first Assembly meeting |
| October 1925 | Locarno Treaties signed |
| 27 August 1928 | Kellogg-Briand Pact signed |
| 18 September 1931 | Mukden Incident / Japanese invasion of Manchuria |
| 30 January 1933 | Hitler appointed Chancellor of Germany |
| March 1935 | German rearmament announced |
| 7 March 1936 | German remilitarisation of the Rhineland |
| July 1936 | Spanish Civil War begins |
| 12 March 1938 | Anschluss with Austria |
| 29--30 September 1938 | Munich Agreement |
| 15 March 1939 | Germany occupies remainder of Czechoslovakia |
| 23 August 1939 | Molotov-Ribbentrop Pact signed |
| 1 September 1939 | Germany invades Poland; Second World War begins |
| 3 September 1939 | Britain and France declare war on Germany |
| 22 June 1941 | Operation Barbarossa: Germany invades the Soviet Union |
| 7 December 1941 | Pearl Harbor attacked; United States enters the war |
| 4--7 June 1942 | Battle of Midway |
| 23 October 1942 | Battle of El Alamein begins |
| 2 February 1943 | German surrender at Stalingrad |
| 6 June 1944 | D-Day: Allied invasion of Normandy |
| 30 April 1945 | Hitler commits suicide in Berlin |
| 8 May 1945 | Germany surrenders unconditionally (V-E Day) |
| 6 August 1945 | Atomic bomb dropped on Hiroshima |
| 9 August 1945 | Atomic bomb dropped on Nagasaki |
| 2 September 1945 | Japan surrenders formally (V-J Day) |
Common Pitfalls
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Presenting appeasement as solely Chamberlain's policy: Appeasement was broadly supported in Britain in the late 1930s by politicians across parties, the public, and the media. Characterising it as Chamberlain's personal failing ignores the context of British economic weakness, the trauma of WW1, and genuine pacifist sentiment. IB essays require a more nuanced assessment.
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Confusing the causes of Japanese expansion: Japan's invasion of Manchuria (1931) was driven by multiple factors: the need for raw materials, the impact of the Great Depression, domestic political instability, and a belief in regional hegemony. Reducing it to "Japanese aggression" without examining these motivations misses key analytical depth.
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Overlooking the League of Nations' structural weaknesses: The League failed not because of bad intentions but because it lacked enforcement power (no army), key nations were absent (USA never joined, Germany/USSR left), and decisions required unanimity. These structural flaws meant it could not prevent aggression by major powers.
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Assuming the Treaty of Versailles solely caused WW2: While the Treaty contributed to German resentment, it was one factor among many. The Great Depression, the failure of the League of Nations, appeasement, and Hitler's expansionist ideology were all necessary conditions. A strong IB essay weighs multiple causes rather than assigning blame to a single factor.