America's failed involvement in the Vietnam War was likely a response to which foreign policy theory?

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The domino theory was a foreign policy theory that suggested if one country fell to communism, neighboring countries would also fall in a domino effect. This theory was used as justification for American involvement in Vietnam, as the United States feared that if they did not intervene, communism would spread throughout Southeast Asia. The failure of American involvement in Vietnam is often attributed to miscalculations based on this theory.

America's Failed Involvement in the Vietnam War Was Likely a Response