Meanwhile, Nazi Germany had brought the Soviet Union into the war as an active belligerent by attacking eastwards in Operation Barbarossa (June 1941).
Expansionism is the doctrine of expanding the territorial base (or economic influence) of a country, usually by means of military aggression.
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The immediate cause was Germany invading Poland on September 1, 1939, and Britain and France declaring war on Germany on September 3, 1939.
Problems arose in Weimar Germany that experienced strong currents of revanchism after the Treaty of Versailles that concluded its defeat in World War I in 1918.The first cause of world war II was the intense anger over the Versailles Treaty.Germany was very angry over two things and the first of which was the many territorial losses they had to endure as a result of the treaty.Britain and France then gave Germany an ultimatum to withdraw, which Germany ignored, and Britain and France declared war on Germany on September 3, 1939.Following the Fall of France in June 1940, the Vichy regime signed an armistice, which tempted the Empire of Japan to join the Axis powers and invade French Indochina to improve their military situation in their war with China.Italy laid claim on Ethiopia and conquered it in 1935, Japan created a puppet state in Manchuria in 1931 and expanded beyond in China from 1937, and Germany systematically flouted the Versailles treaty, reintroducing conscription in 1935 with the Stresa Front's failure after having secretly started re-armament, remilitarizing the Rhineland in 1936, annexing Austria in March 1938, and the Sudetenland in October 1938.All those aggressive moves met only feeble and ineffectual policies of appeasement from the League of Nations and the Entente Cordiale – in retrospect symbolized by the "peace for our time" speech following the Munich Conference, that had allowed the annexation of the Sudeten from interwar Czechoslovakia.Out of all the wars that the world has gone through, none has been more devastating as world war II. Well, world war II had six major causes: anger over the Versailles Treaty, the failure of peace efforts after world war I, the rise of Fascism, the goals of Hitler, the isolationism by America and Britain, and the re-armament of Europe.This paper will go over each of these causes individually and then draw some conclusions about world war II.The second cause of world war II was the failure of the many peace efforts that occurred after world war I.The League of Nations, which was one of Wilson's fourteen points and part of the Versailles Treaty, was a forum in which nations could settle their disputes with one another.