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Most of the residents of Paris fled as the army of Nazi Germany concurred countries across Holland and Belgium into France. (https://www.bbc.co.uk/programmes/p03xvh5r)
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The Japanese planned a surprise aerial attack on the U.S. naval base at Pearl Harbor which caused the United States to enter World War II. (https://www.history.com/topics/world-war-ii/pearl-harbor)
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It was a clash between the U.S. Navy and the Imperial Japanese Navy that began six months after the attack on Pearl Harbor. (https://www.history.com/topics/world-war-ii/battle-of-midway)
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Also known as, Operation Overlord, when 156,000 American, British and Canadian forces landed on five beaches along a 50-mile stretch of the heavily fortified coast of France's Normandy region, under fire by German soldiers. (https://www.history.com/topics/world-war-ii/d-day)
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An American B-29 bomber dropped the world's first deployed atomic bomb over the Japanese city of Hiroshima. The explosion immediately killed 80,000 of the inhabitants. Many later then died of radiation exposure. (https://www.history.com/topics/world-war-ii/bombing-of-hiroshima-and-nagasaki)