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The United States policy of containment after World War II was intended to prevent communism from spreading beyond

the Middle East

South America

the Soviet Union

Western Europe

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the Soviet Union

Explanation:

Where it all started was Soviet Union, and US policy of containment was put in place to "contain" communisium within Soviet itself and prevent it from spreading to nearby region. US had always hated communism so this should not be a surprise and US worried that if communism could not be contained, then countries would fall to it one by one, like dominoes.