how might a nationalist victory in the chinese civil war have affected the outcome of the korean conflict?

Answer 1

There would have been no war in Korea. Possibly also no war in VietNam.
Simply because the supply lines to these two wars went mostly via China, and over 3 milion red Chinese"volunteers" participated in the war in Korea (complete with tanks, artillery and jet aircraft).

BTW the US politicians which made the red chinese victory possible (by cutting off aid to the nationalists) are alive, well and happy. Even though many were proven to be soviet agents- the very people McCarthy (and JFK) was trying to expose. But then, since Hollywoodians believe otherwise- it is McCarthy who will go down in history as the evil man...

Answer 2

china became communists, and N korea who wanted communism influenced from USSR occupation in korea and china. so when N was almost beaten china helped N, and now two countries are split