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The Truman Doctrine was the first statement of US Containment policy in the Cold War. Truman feared that communists would take over Greece and Turkey in 1947. He asked Congress to give aid and support to these nations to avoid the spread of communism.
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First Cold War conflict involving the United Nations. North Korea invaded South Korea to conquer and make the entire nation communist. The UN stepped in under the leadership of the US to stop the invasion. The Chinese entered the war on the side of North Korea.
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HUAC attacked Americans as communist spies
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This event marked the closest the US and USSR ever came to nuclear war! It began when the US discovered missile sites being built in Cuba. It led to a showdown between US and USSR!