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The first atomic bomb was dropped on Hiroshima, Japan, with the next to follow in Nagasaki. This officially ended the war in the Pacific and helped usher in the era of the Cold War.
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A period of arms races, nuclear stockpiling, and tense relations between the Soviets and America. Helped spawn wars in Korea and Vietnam.
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Began when communist North Korea invaded South Korea. Under the policy of containment, U.S. forces intervened.
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