For whatever reason, the CPC choose to invade Vietnam much earlier after Vietnam refuses to ally/effectively become a satellite. Instead of an ANZUS triggered war with North Vietnam, what if because of the aforementioned reason- the PLA took their place?

Would the red 'domino effect' have much less sway in Anglo politics? Would the Americans and Australians unify Vietnam under the North? Keep them separate? Would they support or invade the North alongside the Chinese? Or perhaps would they wash their hands of Vietnam entirely, keeping a token force to prevent the North from going on a feared offensive?
Would the USA, having not learnt it's lesson from Vietnam, be worse for it? Or would they be a lot more proactive, perhaps even better because of it? Would the Indonesian, Malaysian, Laos and Cambodian communist movements change? Perhaps they win or are crushed?
Assuming, just like in OTL: They're defeated or pull out of N. Vietnam, how would that reflect on the CPC?

Personally, I think they'd just watched Vietnam and China go at it. China's aggressiveness might even strain Sino-Soviet relations. Maybe they'd support weapons smugglers to weaken the PLA through the Viet Cong. Might have a N.-S. situation like in Korea, though reunification efforts might be a lot more likely without CPC sway in Vietnam. Maybe a Communist party would be legalized and reunification happens sometime after the fall of the USSR.
 
It was the CPC idea to support North Vietnam for infiltrating the South and start an insurgency, while the Soviets wanted co-existance for now (remember, Khrushchev was in power). The only way for it to happen is North Vietnam started accepted Soviet industrialization and never attempted to go for the South. More chance if the U.S. didn't rig the 1954 in South Vietnam, which would result in unification with the North. Détente could allow Vietnam to have more friendly relations with the West, considering Vietnam never wanted Chinese influence in the country, therefore being a obstacle in China's eyes. China would be sandwiched by unfriendly Soviet Union, cautious Vietnam on the southern border
 
Saigon might make some opportunistic moves on their own to grab a couple dozen square kilometers on the border, I imagine.
 
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