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  The US end its policy of isolationism and enters the war.
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  The US freezes prices of good and begins rationing food, gas, and other supplies needed for the soldiers
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  Roosevelt signs off the begin the interment of Japanese-American citizens
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  The ration on coffee offically begins
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  The US expands the draft by a year; 18-37 year olds could now be drafted
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  Candian, American, and other Allied forces storm the beach of France
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  The atomic bomb is tested and is successful
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  Truman decides to drop the aotmic bormb, the bomb is dropped 3 days later
 http://www.trumanlibrary.org/teacher/abomb.htm