1
1939 – World War II begins when Germany invades Poland
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2
1940 – Germany conquers France and controls Western Europe
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3
1941 – Attack on Pearl Harbor brings the U.S. into the war
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4
1941–1943 – Germany fights the Soviet Union on the Eastern Front
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5
1943 – Allies decide to open a second front in Western Europe
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6
1943 – Planning begins for Operation Overlord
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