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

The United States provided military aid and advisers to South Vietnam as part of its effort to contain the spread of communism. In the 1950s, this let the U.S. support South Vietnam without yet sending large numbers of American combat troops into a war. So the best answer is “to help South Vietnam without committing US troops to a war.”

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