Which of the following best explains why the United States sent military aid to South Vietnam in the 1950s?

In the 1950s, the United States provided military aid and advisers to support South Vietnam against Communist forces, while avoiding a direct commitment of U.S. combat troops. This policy reflected containment: helping an ally resist Communism without entering a full-scale war. So the best choice is “to help South Vietnam without committing US troops to a war.”

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