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Causes of World War II

The causes of World War II have been given considerable attention by historians. The immediate precipitating event was the invasion of Poland by Nazi Germany on September 1, 1939, and the subsequent declarations of war on Germany made by Britain and France, but many other prior events have been suggested as ultimate causes. Primary themes in historical analysis of the war's origins include the political takeover of Germany in 1933 by Adolf Hitler and the Nazi Party; Japanese militarism against China, which led to the Japanese invasion of Manchuria and the Second Sino-Japanese War; or Italian aggression against Ethiopia.

For broader coverage of this topic, see Diplomatic history of World War II.

During the interwar period, deep anger arose in the Weimar Republic over the conditions of the 1919 Treaty of Versailles, which punished Germany for its role in World War I with heavy financial reparations and severe limitations on its military that were intended to prevent it from becoming a military power again. The demilitarisation of the Rhineland, the prohibition of German unification with Austria, and the loss of its overseas colonies as well as some 12% of its pre-war land area and population all provoked strong currents of revanchism in German politics.


During the worldwide economic crisis of the Great Depression in the 1930s, many people lost faith in liberal democracy and countries across the world turned to authoritarian regimes.[1] In Germany, resentment over the terms of the Treaty of Versailles was intensified by the instability of the German political system, as many on both the Right and the Left rejected the Weimar Republic liberalism. The most extreme political aspirant to emerge from that situation was Adolf Hitler, the leader of the Nazi Party. The Nazis took totalitarian power in Germany from 1933 and demanded the undoing of the Versailles provisions. Their ambitious and aggressive domestic and foreign policies reflected their ideologies of Antisemitism, unification of all Germans, the acquisition of "living space" (Lebensraum) for agrarian settlers, the elimination of Bolshevism and the hegemony of an "Aryan"/"Nordic" master race over "subhumans" (Untermenschen) such as Jews and Slavs. Other factors leading to the war included the aggression by Fascist Italy against Ethiopia and by Imperial Japan against China.


At first, the aggressive moves met with only feeble and ineffectual policies of appeasement from the other major world powers. The League of Nations proved helpless, especially regarding China and Ethiopia. A decisive proximate event was the 1938 Munich Conference, which formally approved Germany's annexation of the Sudetenland from Czechoslovakia. Hitler promised it was his last territorial claim, nevertheless in early 1939, he became even more aggressive, and European governments finally realised that appeasement would not guarantee peace but by then it was too late.


Britain and France rejected diplomatic efforts to form a military alliance with the Soviet Union, and Hitler instead offered Stalin a better deal in the Molotov–Ribbentrop Pact of August 1939. An alliance formed by Germany, Italy, and Japan led to the establishment of the Axis powers.

Interwar period[edit]

During the Polish–Soviet War of 1920, France, one of the most active supporters of Poland, sent the French Military Mission to Poland to aid the Polish army. In early February in Paris, three pacts were discussed by Polish Chief of State Józef Piłsudski and French President Alexandre Millerand: political, military and economic.


The political alliance was signed there on February 19, 1921 by Polish Minister of Foreign Affairs Count Eustachy Sapieha and French Minister of Foreign Affairs Aristide Briand, in the background of the negotiations that ended the Polish–Soviet War by the Treaty of Riga. The agreement assumed a common foreign policy, the promotion of bilateral economical contacts, the consultation of new pacts concerning Central and Eastern Europe and assistance in case one of the signatories became a victim of an "unprovoked" attack. As such, it was a defensive alliance. The secret military pact was signed two days later, on February 21, 1921, and clarified that the agreement was aimed at possible threats from both Germany and the Soviet Union. An attack on Poland would make France keep lines of communication free and Germany in check but not require it to send troops or to declare war. Both political and military pacts were legally not in force until the economic pact was ratified, which occurred on August 2, 1923.


The alliance was further extended by the Franco–Polish Warrant Agreement, signed on October 16, 1925 in Locarno, as part of the Locarno Treaties. The new treaty subscribed all previously-signed Polish–French agreements to the system of mutual pacts of the League of Nations.


The alliance was closely tied with the Franco-Czechoslovakian Alliance. France's alliances with Poland and Czechoslovakia were aimed at deterring Germany from the use of force to achieve a revision of the postwar settlement and ensuring that German forces would be confronted with significant combined strength of its neighbours. Although Czechoslovakia had a significant economy and industry and Poland had a strong army, the French–Polish–Czechoslovakian triangle never reached its full potential. Czechoslovakian foreign policy, under Edvard Beneš, avoided signing a formal alliance with Poland, which would force Czechoslovakia to take sides in Polish–German territorial disputes. Czechoslovakia's influence was weakened by the doubts of its allies as to the trustworthiness of its army, and Poland's influence was undermined by fighting between supporters and opponents of Józef Piłsudski. France's reluctance to invest in its allies' industry (especially Poland's), improve trade relations by buying their agricultural products and share military expertise further weakened the alliance.


In the 1930s, the alliance remained mostly inactive and its only effect was to keep the French Military Mission to Poland, which had worked with the Polish General Staff ever since the Polish–Soviet War of 1919–1920. However, with the German threat becoming increasingly visible in the latter part of the decade, both countries started to seek a new pact to guarantee the independence of all contracting parties and military co-operation in case of a war with Germany.

Kallis, Aristotle (2000). Fascist Ideology. London: Routledge.  9780415216128.

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Paxton, Robert O. (2011). Europe in the Twentieth Century. United States: Wadsworth.  9781133171126.

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Bell, P. M. H. The Origins of the Second World War in Europe (Routledge, 2014).

—Explains the long term conflict between Germany and France over the centuries, which was a contributing factor to the World Wars.

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