It was a policy, in which the US tried to stop communism, although the government decided not to interfere with nations that already had communist government.
Containment was a U.S. policy during the Cold War aimed at preventing the expansion of communism, primarily articulated by diplomat George F. Kennan in 1946. It involved providing political, military, and economic support to countries resisting communism, under the belief that unchecked communism could threaten democratic nations. This strategy was a fundamental aspect of U.S. foreign policy throughout the Cold War era.
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