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Truman becomes president
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Atomic bombs dropped on Hiroshima and Nagasaki
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Cold War begins between U.S. and Soviet Union
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Truman Doctrine
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NATO Treaty
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Korean Conflict
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Presidency of Truman ends
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NASA formed
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Cuban revolution
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Greensboro Sit-in
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Vietnam war begins
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Cuban missile crisis
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President Kennedy assassinated
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Johnson elected president
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Civil Rights Act
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Presidential candidate Robert Kennedy is assassinated
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Nixon elected president
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Johnson's presidency ends
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Neil Armstrong walks on the moon
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Watergate Scandal
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Nixon resigns