The NVA and the VC (North Vietnamese Army and the Viet Cong).
Communists.
France
they were used to spark protest against America's involvement in the Vietnam War
The United States where fighting the North Vietnamese Army to deter communism in South Vietnam. The Chinese also were a part of the conflict however not so much as a direct entity as a funding source for the NVA.
The Vietnam conflict was a type of proxy war, in that our Cold War foe, Russia, heavily subsidized Communist North Vietnam in their fight with U.S. forces.
The Viet Cong (VC) were communists living in South Vietnam. Later, the regular army units of North Vietnam would enter the fight (NVA). Diem was the first president of South Vietnam in 1955. He was assassinated in 1963.
America helped out SOUTH Vietnam. NORTH Vietnam was attacking it.
The tactic used was guerrilla warfare.
America fought against North Vietnam, in an unsuccessful attempt to defeat its invasion and conquest of South Vietnam.
Many who didn't have to fight the war, were for it. Many who had to fight the war, were against it.
North Vietnam (capital was Hanoi).
The United States didn't fight against South Vietnam in fact they were allies fighting against North Vietnam.
Only North Vietnam fought against America since the Americans had sided with North Vietnam at the time. The war involved with America began in 1954 and ended January of 1975. It extended at least 21 years, give or take.
The OSS was in contact with Ho Chi Minh and worked closely with him against the Japanese.
Eisenhower sent troops to South Vietnam so they can fight North Vietnam because North Vietnam wanted to take over South Vietnam and they did.
America "Helped" Vietnam against "the communists" and i think that's it.
The fight against the spread of Communism.
To defend against Communist expansion.