Question

What happened shortly after the United States left Vietnam?

The North Vietnamese retreated.
North Vietnam kept Communism out South Vietnam permanently.
North Vietnamese took over South Vietnam, spreading Communism southward.
Vietnam agreed to leave South Vietnam in sixty days.

Answer 1

North Vietnamese took over South Vietnam, spreading Communism southward. is the correct answer.

Answer 2

North Vietnamese took over South Vietnam, spreading Communism southward. is the correct answer.