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Nazi Germany and the Soviet Union invaded Poland. This began WWII. France and Britain previously vowed to attack Germany if Hitler attacked Poland. Therefore France and Britain declared war on Germany on September 3rd.
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Germany invaded Paris and the Low Countries from May until June when they agreed to an armistice.
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Germany's air force, Luftwaffe, attacked Britain. Also considered the first combat solely fought by air forces.
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Under the codename Operation Barbarossa, Hitler aimed to destroy the Soviet Union and Communism
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One of the largest and bloodiest battles in history; Nazi Germany fought the Soviet Union for control of one of their cities, Stalingrad. The Germans ended up having to surrender at Stalingrad and losing the entire German Sixth Army.
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A Japanese aircraft surprise attack of the US Naval Base, Pearl Harbor, trying to knock out the US fleet in the Pacific and therefore hoping to dominate the pacific.
