redlightning
Banned
The only way I can see this the South winning the Vietnam War is maintaining a ceasefire or armistice with the North. They will not win militarily and dissolve the North, especially not alone.
Perhaps the US creates a neutrality accord with China and the Soviet Union in the 1960s which severely reduces foreign aid to North Vietnam. The Vietcong are never strong enough to overtake its neighbor to the south. Eventually after decades of fighting, it becomes a war of attrition and both simply sign a permanent ceasefire to end the fighting.
Another option is that the US invades North Vietnam and topples the the government there instead of just defending the South.
The US could also establish permanent bases and significant funding as Nixon and Ford wanted to do to keep the country going and defended. It never collapses and is conquered as a result.
Perhaps the US creates a neutrality accord with China and the Soviet Union in the 1960s which severely reduces foreign aid to North Vietnam. The Vietcong are never strong enough to overtake its neighbor to the south. Eventually after decades of fighting, it becomes a war of attrition and both simply sign a permanent ceasefire to end the fighting.
Another option is that the US invades North Vietnam and topples the the government there instead of just defending the South.
The US could also establish permanent bases and significant funding as Nixon and Ford wanted to do to keep the country going and defended. It never collapses and is conquered as a result.