The US helped in order to stop the spread of Communism into another nation and it was Viet Nam.
America helped out SOUTH Vietnam. NORTH Vietnam was attacking it.
Many who didn't have to fight the war, were for it. Many who had to fight the war, were against it.
Yes, South Korea is an ally of the Republic of Vietnam. During the Vietnam War, South Korea helped the United States and the Republic of Vietnam to fight against the communists. The Republic of Vietnam was helped by South Korea, by the United States, by Thailand, by Taiwan, by New Zealand, by Australia, by Singapore and by Malaysia!
The United States helped South Vietnam fight the war.
North Vietnam (capital was Hanoi).
The United States didn't fight against South Vietnam in fact they were allies fighting against North Vietnam.
North VN vs South VN; US helped the South.
Eisenhower sent troops to South Vietnam so they can fight North Vietnam because North Vietnam wanted to take over South Vietnam and they did.
The fight against the spread of Communism.
To defend against Communist expansion.
Members of society were being drafted to fight the Vietnam War; consequently, they were against it.
NVA and VC, same as with the rest of the allies.