‘Sino-American Relations With Lasting Nationalist China’.
The easiest POD to get a Nationalist victory is for the West to decide early on that the commies are bad news, and to thus refrain from pushing for a cease-fire between the Nationalists and the reds in China. This requires aggressively backing the Nationalists against Japan, which... well, I suppose it's possible, but not altogether easy to get done. If the USA does do it, though, the chances of good relations with China have just improved massively.
During the war against Japan, alliance with Nationalist China only makes even more sense, and afterwards, China will be an ally in hemming in the USSR. A result of this is that long-term good relations are actually quite plausible. Nationalist China would do significantly better than Communist China. So the period where China is rapidly developing and potentially an economic risk to the USA co-incides with the Cold War. By the time that ends, China will have developed quite significantly. (And more evenly than any communist system might manage. That's right, kids: less communism would
reduce the wealth disparities.)
So by the time the USA stops worrying about the USSR, China is no longer such a cheap low-labour country anymore, actually making them less of an economic threat and more of a useful trade partner.
Side effects include a unified Korea and a non-communist Vietnam (where, hilariously, the USA and China probably allied to kick the French out). All three will be fairly subordinate to China (the "three ducklings").
Geopolitically, I expect that this set-up will very quickly produce an understanding between Russia and India. I could also see Indonesia feeling threatened by China, and getting on board with the Russo-Indian bloc in order to have friends that can keep China at bay just a bit.
