Which of the following was the main reason that the United States became involved in the conflict between North and South Vietnam?

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The United States became involved in the conflict between North and South Vietnam primarily because it feared the spread of communism throughout Southeast Asia. The U.S. believed that if Vietnam fell to communism, it would lead to other countries in the region also becoming communist, a phenomenon known as the domino theory. This led the U.S. to support South Vietnam with military aid and troops, in an effort to prevent the spread of communism.

Which of the Following Was the Main Reason That the United