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The thirteenth amendment ratified
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Thomas Edison invents the light bulb
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U.S. fights Spanish American war
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World War I begins in Europe
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U.S. declares war on Germany
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Treaty of Versailles ends WWI
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The great depression begins
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Stock market crashes
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Dust Bowl
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World War II begins
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Japanese planes bomb U.S. naval base at Pearl Harbor
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U.S. drops atomic bombs in Japan
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World War II ends
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Berlin airlift begins
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North Korean troops cross the 38th parallel
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Supreme court rules on brown v board of education
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Montgomery bus boycott
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USSR launches sputnik
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Congress passes voting rights act
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Tet offensive launches