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The Yalta Conference and the Potsdam Conference had laid down some principles concerning the immediate post-war treatment of Germany. The Western nations and the Soviet Union interpreted these principles in different ways, conflict started as a consequence of this.
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The United states drops atomic bomb on Hiroshima (20 kiloton bomb 'Little Boy' kills 80,000).
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The United States drops atomic bomb on Nagasaki (22 kiloton 'Fat Man' kills 70,000)
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"Sinews of Peace" Iron Curtain Speech by Winston Churchill - "an "iron curtain" has descended on Europe"
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Truman's Loyalty Program created to catch Cold War spies
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Russia tested its first atomic bomb.
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Communist Mao Zedong takes control of China and establishes the People's Republic of China.
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Truman approved H-bomb development
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Korean War begins. Stalin supports North Korea who invade South Korea equipped with Soviet weapons.
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Federal Civil Defense Administration established.
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A-bombs developed by Britain.
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Nuclear Arms Race atomic test series of 11 explosions at Nevada Test Site.
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Korean War ends.
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H-bomb Castle-Bravo test.
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USSR sent tanks into Poznan, Poland, to suppress demonstrations by workers.
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USSR sent military aid to Afghanistan.
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Sputnik launched into orbit.
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Explorer I launched.
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Khrushchev demands withdrawal of troops from Berlin.
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A-bombs developed by France.
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Nuclear Test Ban Treaty ratified.