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Invasin of Poland Hitler invades Poland. Britain and France declare war on Germany 2 days later.
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Battle of Britain begins.
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Germany invades the USSR, opening what becomes known as the Eastern Front.
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The Imperial Japanese Navy attacks the US Pacific Fleet anchored at Pearl Harbor, Hawaii. US enters the war, opening the Pacific Theatre.
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Battle of Midway. The US Navy sinks four Japanese aircraft carriers in the fight that proves to be the turning point in the Pacific war.
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Battle of Stalingrad. Germany's entire Sixth Army is lost, and the war begins turning in favor of the Allies.
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British and American leaders met in Quebec to coordinate war plans. At the meetings, which were led by Churchill and Roosevelt, leaders discussed the upcoming landing in Italy, as well as summit plans with Stalin.
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The Allied Expeditionary Force under Dwight Eisenhower lands on the coast of northern France on what will later be called "D-Day". The "Second Front" that Stalin has been demanding for three years is now open.
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The German forces made a surprise attack against US forces in Belgium. The Germans made rapid progress, but were unable to capture the city of Bastogne, where Ameican forces were encircled. The US and the Brtish were able to counterattack, and the Germans were forced to withdraw, but not before US forces lost 35,000 men.
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Japan announced its surrender after being hit with two American atomic bombs, which officially ended WW2.