Which theory referred to the policy held by certain U.S. presidents, positing that the Communist takeover of Vietnam or Korea during their respective wars would lead to the fall of other Asian countries as well?

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The theory referred to is the Domino theory, which was the belief that if one country fell to communism in Southeast Asia, then neighboring countries would also fall like a row of dominoes. This theory influenced U.S. policy towards Vietnam and led to the deployment of troops and military intervention to prevent the spread of communism.

Which Theory Referred to the Policy Held by Certain U