It was never popular; it was unknown.
to keep north Vietnam from taking over south Vietnam....
No
North was the communists the souyh capitalists.
1955 to 1975
The ground war, in the Vietnam War, WAS FOUGHT in SOUTH VIETNAM. Therefore, South Vietnam entered the war from the very beginning...which is when it started in either the late 1950's or 1961, depending on what historical reference you are using.
In the beginning it was very popular but then it wasn't.
In the beginning Ngo Dinh Diem, but they went throught many governments.
France
It was an issue which divided the US.
The popular support for Cold War theories was weakened by the outcome of the Vietnam war. It had also weakened the moral of the US military.
Our political liaisons supported a free election type government in South Vietnam from the beginning in 1955.
The Vietnam War introduced an element of bitter satire into popular culture and entertainment.