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Yalta Conference Cold War Begins-End of Soviet Union Cold War Ends
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Truman declares active role in Greek Civil War
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Marshall Plan is announced
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NATO ratified
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Soviets explode first atomic bomb
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Korean War begins
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Korean War Ends
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The start in Vietnam, Laos, and Cambodia
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Sputnik launched into orbit
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Sputnik is in orbit
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Bay of Pigs invasion
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Missle being put in Cuba
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North Vietnam defeats South Vietnam