Ineed . how did vietnam become a single communist nation?
question 2 options:

it did not become a single communist nations, but instead remained two separate countries until uniting and becoming a democracy in 2000.

u. s. troops withdrew and north vietnamese troops successfully invaded south vietnam.

north vietnam developed a strong economy that led south vietnam to request unification.

china negotiated a settlement between north and south vietnam that joined the two countries into a single communist nation

Correct

Explanation:

US President Richard Nixon had instituted a policy of "Vietnamization" in regard to the Vietnam War, which  emphasized that the United States needed to empower South Vietnamese forces to assume more combat duties.  He proposed drawing down US involvement in the war and seeking "peace with honor," as he put it.  By the time that President Nixon and US policy shifted to this sort of approach, it was too late to stave off the victory of the North Vietnamese and Viet Cong forces.  The US eventually withdrew its forces from Vietnam in 1973.  By 1975, Saigon, the capital of South Vietnam, fell to the North Vietnamese communist forces.  South Vietnam unconditionally surrendered to North Vietnam on April 30, 1975.

electricity

so thats all folks