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The United States decided to get revenge and dropped an atomic bomb on Hiroshima, Japan, killing over 80,000 people.
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The United States Marine troops invade the Guadalcanal Islands in order to spark the first American offense in World War II.
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The Jefferson Memorial is built in Washington, D.C as a presidential memorial for President Jefferson.
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Allied forces rushed the beaches of France to mark the start of World War II invasion of Europe. At least 4,000 troops died and roughly 10,000 were injured.
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President Roosevelt passes away suddenly. Truman takes over the role as the commander in chief of World War II.
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Three days after the first atomic bomb in Hiroshima, another bomb is dropped in Nagasaki, Japan, killing between 129,000 and 226,000 people. The Japanese army soon surrendered.
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President Truman signed a doctrine that established military, political, and economic assistance to all democratic nations under threat from the authoritarian forces.
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The Korean War began when around 75,000 troops from the Korean Army crossed the boundaries of the Democratic People's Republic of Korea to the north and the Western Republic of Korea to the south. Over 150,000 troops died in the battle.