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Hitler's invasion of Poland in September 1939 drove Great Britain and France to declare war on Germany, marking the beginning of WW2
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Germany started the war against U.S.S.R
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USA was giving their allies military equipment in 1940 but entered in 1941
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Japan joined the war 2 years later on the 7th of December 1941.
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to prevent the United States Pacific Fleet from interfering with its planned military actions
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The United States declared war on Japan on December 8, 1941. Japan's allies, Germany and Italy, declared war on the United States on December 11.
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the Allies defeated Japan and the Nazi Germany.
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Russia,Germany,Polan,Ukraine,Belarus,India and Japan.
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Mexico,Mongolia,Canada,Iran,Turkey,Iraq
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Japan announced their surrender at the end of WW2