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The event that officially started World War 2 in European theater (ETO) was when Hitler, after breaking multiple parts of the treaty of Versailles's. reforming army, reoccupying the Rhineland, occupying & annexing the anschlus, ect.), invaded Poland on September 1st,1939. Great Britain and France declare war on Germany because the league of nations was not stepping in and doing its job to stop Germany from breaking the rules laid out in the treaty of Versailles's.

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