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World War II started because Germany was angry after the Treaty Versailles. Hitler came to be powerful and promised to make Germany strong again. He used Blitzkrieg/ lightning war, to invade other countries, which began the fighting.

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The Allies were the United States, Great Britain, Soviet Union, and later France. The Axis powers were Germany, Italy, and Japan.

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The U.S join the war after Japan attack Pearl Harbor in 1941. The attack sank ships, destroying planes and killed many Americans. The very next day, President Roosevelt declared war.

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History Brief: the United States Enters World War I

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On June 6, 1949, Allied somewhere invaded Normandy, France. They fought on the beaches to push back the Germans: D-day helped turn the war in favor of the Allies.

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The Holocaust was when Nazis murdered six million Jews during WWII. This was caused by anti-Semitic, or hatred of Jewish people. After the war, the Nuremberg trails punched Nazi leaders.

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In the Pacific, the U.S used "island hopping" to get closer to Japan. Japanese pilots carried kamikaze suicide attacks. Cities were also destroyed by fire-bombing.

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Americans grew victory gardens and watched Hollywood propaganda to support the war. People bought war bonds to raise money. Sadly. Japanese Americans were forced into internment camps.

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Germany surrendered May 1945 called V-E Day in the Pacific the US tribe atomic bombs on Hiroshima and Nagasaki. Japan then surrendered two weeks later in August 1945.