What happened shortly after the United States left Vietnam?

After the U.S. had withdrawn all its troops, the fighting continued in Vietnam. South Vietnam officially surrendered to communist North Vietnam on April 30, 1975. On July 2, 1976, Vietnam was reunited as a communist country, the Socialist Republic of Vietnam.

answer; i believe that the correct answer is (c) arctic tundra;

answer; william penn's approach made the colony diverse by attracting many types of people and religions;