This question was asked but everyone had it wrong-- HERE IS THE CORRECT ANSWER!! How did the Vietnam War end? Check all that apply.
-North Vietnam attacked Saigon.
-Communism gained control.
-South Vietnam defeated North Vietnam.
-US soldiers returned to help.
-South Vietnam surrendered to North Vietnam.

CORRECT ANSWERS: North Vietnam attacked Saigon.
Communism gained control. South Vietnam surrendered to North Vietnam.

Explanation:

The Vietnam war ended on the 30th of April 1975 when the capital of South Vietnam, Saigon, fell to the North Vietnamese forces who had earlier launched a full scale attack against the capital with the U.S. having stopped supporting the South Vietnamese with manpower.

With the fall of Saigon, South Vietnam formally surrender to North Vietnam and the Communist government of North Vietnam then united the entire country under one single Communist government.

all of them are correct

the revolution instituted a short-lived roman republic.