5. President Truman believed in the political theory that if one country fell to communism, then the surrounding countries would also fall. What was the name given to this theory? domino theory socialism DMZ social choice theory
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The theory that President Truman believed in is known as the "domino theory." This idea suggested that if one nation in a region fell under communist influence or control, neighboring countries would soon follow, much like a row of dominoes falling one after the other. This perspective played a significant role in shaping U.S. foreign policy during the Cold War, as it led to interventions in various countries to prevent the spread of communism. In real-world applications, the domino theory was a driving force behind U.S. involvement in conflicts such as the Vietnam War. American leaders feared that if Vietnam fell to communism, it would lead to a chain reaction that would threaten other countries in Southeast Asia. This led to extensive military and economic support for anti-communist regimes, illustrating how theories can significantly influence international relations and wartime decisions.