Communist north vietnam successfully invaded the south to spread communism and unite the country. true false

True.

The United States fought in the Vietnam war for South Vietnam in hope to stop the spread of communism farther due to the domino effect. However, they had lost the war, allowing North Vietnam to invade and unite the country as communist.

Therefore, this is true as the North Vietnamese had succeeded in uniting the country as a communist force.

Hope this helps!