Effects of Republic of China prevailing on the US

Depends, how friendly are they with the Soviets? They had tried to be nice for the longest of times but they probably have given up at this point. Depends on what occupation zones the Russians might have, though they did voice support for a united China.
 
The Cold War policy of containment in East Asia was largely a reaction to the perceived inadequacies of the US response to the communist takeover in China, so the general willingness to get involved in places like Korea and Vietnam would be determined by a completely different set of factors.
 
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