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Mao Zedong headed the Long March with the communist party. This saved the Communist Party from Chiang Kai-shek and the Guomingdang attacks.
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When Germany invaded Poland, France and Great Britain declared war on Germany marking the start of World War II. This invasion tested Hitler's strategy, Blitzkrieg.
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Japan conducted a surprise attack on Pearl Harbor, Hawaii on December 7, 1941. Roosevelt described it as a date that will live in infamy.
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Germany signed the surrender document in Reims, France. This ended the war in Europe.
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General Leslie Groves headed the Manhattan Project, a top secret plan to develop atomic bombs. In 1945, the United States used bombs on Hiroshima and Nagasaki.
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The United Nations were formed after World War II to avoid further conflict. It replaced the League of Nations.