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ww2 began on september 1, 1939 and the treaty of versailles was one of the things that started it. http://www.history.co.uk/study-topics/history-of-ww2/treaty-of-versailles
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Hitler invaded poland by bombing early on to destroy the enemy’s air capacity, railroads, communication lines. Then with his troops, tanks, and artillery he would start to invade what was left. This strategy would become called the blitzkrieg "lightning".
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France signed the armistice with germany. This armistice provided for the German occupation of the northern half of the country and permitted the establishment of a collaborationist regime in the south with its seat in the city of Vichy.
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Germany and their allies invade the soviet union. This was against the German-Soviet Pact.