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The United Nations were formed post-WWII to maintain international peace and security.
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The Hollywood 10 was a group compromised of 10 movie directors, screenwriters, and producers who appeared before the House of Un-American Activities Committee and refused to answer questions about possible communist affiliations.
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The Truman Doctrine was a program that gave money to countries to fight the spread of communism.
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The Marshall Plan proposed that the US provide economic assistance to help restore postwar Europe.
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NATO was established to help secure peace in Europe, along with binding the Allies with democracy.
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The Korean War was a war that broke out between communist, Soviet-backed North Korea, and democratic, US-backed South Korea in an attempt to unite the two countries.
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The Space Race was a competition to achieve superior spacial flight and space access between the US and Soviet Union.
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The Bay of Pigs was a failed invasion on the southwestern coast of Cuba that was led by a group of Cuban exiles. It was secretly financed by the US in an attempt to overthrow Fidel Castro's communist government.
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The communist government, the German Democratic Republic (East Germany) built a concrete and barbed wire wall to separate communist East Berlin and Democratic West Berlin.
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3,500 US Marines arrived on the shore of Da Nang as the first wave of troops in South Vietnam. The US joined the war in an attempt to prevent the spread of communism spreading to South Vietnam.
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The Soviet Union invaded Afghanistan because they saw the country as geographically advantageous.
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After the Cold War began to "thaw," East Berlin's communist party announced a change in relations between East and West Berlin and tore down the barrier separating the cities.