At any time between 1963 and 1975, the Vietnam War could have been won within two months.
Only if the demonstrations here in the US stopped.
South Vietnam totally could exist today if the war was conducted by the military, and not the White House.
Not sure about Laos though, they seemed rather doomed. Cambodia too depending on when the war ends.
And neither the Republicans or Democrats chose to do it and when a Fundamentalist Christian preacher led hundreds of thousands of people onto the streets of Washington calling for a military victory in Vietnam the RIchard NixOn FCC shut down his radio station on Fairness Doctrine grounds......