Belief in the ________ drew the USA into numerous 20th century conflicts (Vietnam,most notably).

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The domino theory was the belief that if one country fell to communism, neighboring countries would also eventually fall like dominos. It was this belief that led the United States to intervene in Vietnam and other conflicts in the 20th century, in attempts to prevent the spread of communism. The Heartland theory, on the other hand, was a geopolitical theory that suggested the control of the "pivot area" of the world (Eurasia) would give a nation the power to control the world. While this theory had some influence in the 20th century, it did not directly lead to US involvement in conflicts.

Belief in the ________ Drew the USA into Numerous 20th