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Germany invades Poland. The Soviet Union also invades Poland. War takes off in Europe. (Source-https://www.ushmm.org/wlc/en/article.php?ModuleId=10005070)
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Germany invaded first invaded France.They made their way to Paris. Soon after, they captured the city of Paris. (Source-http://www.secondworldwarhistory.com/invasion-of-france.asp)
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The Battle of Britain started when Germany bombed the city of London. The battle of Britain lasted for several months. It ended on Halloween. (Source- http://www.history.com/this-day-in-history/the-battle-of-britain-begins)
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The U.S. gave Britain war supplies. They gave them naval ships and other war supplies. In return, Britain gave the U.S. military bases in Bermuda and the Caribbean. (Source-https://www.ourdocuments.gov/doc.php?flash=true&doc=71)
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Japan bombed Pearl Harbor, because of the Lend Lease. They also bombed places in Hawaii. Thousands of people died because of the bombs. (Source- http://www.history.com/topics/world-war-ii/pearl-harbor)
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After the bombing of Pearl Harbor, Germany declared war on the U.S. The U.S. declared war on Germany. The U.S. also declared war on Japan. (Source-http://www.history.com/this-day-in-history/germany-declares-war-on-the-united-states)
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The U.S. beat Japan in a battle called "the Battle of Midway." This was the turning point in war in the Pacific. Japan never really recovered from this loss. (Source- http://www.history.com/topics/world-war-ii/battle-of-midway)
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Germany invaded the Soviet Union. The Soviet Union defeated Germany. This was the turning point for war in Eastern Europe.
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American troops and other Allied troops land in Normandy, France. They began the liberation of Western Europe. This event was called "D-Day." (Source-https://www.army.mil/d-day/?from=features)
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The U.S. dropped atomic bombs in two cities in Japan. The cities were Hiroshima and Nagasaki. This forced Japan to surrender and World War II end. (Source-http://www.history.com/this-day-in-history/atomic-bomb-dropped-on-hiroshima)