It would be "d. appointment power" that allows him or her to appoint ambassadors, cabinet members, and all military officers, since this is one of the ways in which the president exerts his power over the nation.
The answer to the question is Korea
The Vietnam War was fought between South Vietnam and North Vietnam. The U.S. aided South Vietnam while North Vietnam was aided by the communist Soviet Union. The war was at a stalemate for awhile even with the help of the U.S. on the South's side. The U.S. left the war due to public discontent. Two years later North Vietnam conquered South Vietnam, and they became a united nation again.
