The NVA & VC were the only combatants against the allies.
China
Communist North Vietnam re-united with the NON-Communist SOUTH Vietnam, creating ONE Communist country; Vietnam.
Vietnam became one communist country.
During the Viet War North Vietnam was a communist nation; the Republic of South Vietnam, which no longer exists, was a free democratic nation. After the war ended in 1975 both N & S Vietnam became one communist country (because North Vietnam won the war, they conquered the Republic of South Vietnam).
North Vietnam (and its successor state Vietnam) are not democratic states. They are commonly considered "Communist States" and are, more specifically, Leninist One-Party States where the one party in charge is called the Communist Party. During the Second Indochinese War (called the Vietnam War in the US), the Communist Party of Vietnam was more "honestly" communist than it is today, when it has made a number of capitalist reforms. However, like China, the increase of economic reforms has not been complemented by a rise of political reforms.
Communist North Vietnam successfully re-united with it's southern half, creating one communist Vietnam country.Unification forthe country of Vietnam.
Not angering the US for one. Said another way; appeasing the US.
About one half of the American people.
Because of the domino theory. The North was communist and wanted to unite Vietnam to become one communist country. The USA backed the south because it wasn't communist and didn't want Vietnam to fall to communism.
North and South became one communist Vietnam nation.
Vietnam is currently ruled by the Communist government led by President Nguyen Minh Triet.
During the Vietnam War, North Vietnam was communist, and South Vietnam wasn't. Following the war, the unified country is now communist (and is one of the very few remaining communist nations).