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1939 September 1 - Germany invades Poland. World War II begins.
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1941 December 7 - The Japanese attack the US Navy in Pearl Harbor. The next day the US enters World War II on the side of the Allies.
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1942 June 4 - The US Navy defeats the Japanese navy at the Battle of Midway.
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1945 February 19 - US Marines invade the island of Iwo Jima. After a fierce battle they capture the island.
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1945 April 12 - US President Franklin Roosevelt dies. He is succeeded by President Harry Truman.
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1945 April 30 - Adolf Hitler commits suicide as he knows Germany has lost the war.
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1945 August 6 - The United States drops the Atomic Bomb on Hiroshima, Japan. The city is devastated.
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1945 September 2 - Japan surrenders to US General Douglass MacArthur and the Allies.