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The United States dropped an atomic bomb on Hiroshima.
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The United States dropped an atomic bomb on Nagasaki, killing 70,000.
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USSR tested its' first atomic bomb.
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Truman approves H-Bomb development.
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Britain developed its' first atomic bomb.
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This was a test series of 11 explosions at Nevada State Test Site.
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France developed its' first atomic bomb.
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The Nuclear Test Ban Treaty was ratified.
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China develops its' first atomic bomb.
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