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From September 1, 1939 to October 6, 1939. One key individual in this battle was Adolf Hitler, because he decided to invade Poland with the German Army. This battle is significant because it is the beginning of WWII.

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Happened on December 7, 1941. A key individual in the event is Franklin D. Roosevelt, because he got America to become industrialized and ready for war. The outcome of this is that the U.S. enter WWII.

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From September 30, 1941 to April 20, 1942. One key individual involved was Joseph Stalin because he was the leader of Russia. The significance of this battle is that the Soviet victory prevented the Germans from defeating Russia.

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From June 22, 1941 to December 5, 1941. One key individual in this was Adolf Hitler because he ruled Germany and planned the attack. The significance of the battle is that it brought U.S.S.R. into the war against Germany, starting a second front.

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From July 10, 1940 to October 31, 1940. One key individual in this was Winston Churchill, who was Britain's leader. The outcome was that Hitler's Luftwaffe lost to Britain's Royal Air Force.