How would one go about doing this? Getting McArthur out of the picture a few years earlier? I've read that UN bombing runs against Chinese bases north of the Yalu were actually quite few in number, so keeping the Chinese out of the war might have to involve a curtail in the advance of UN ground forces as they near the border. However, simply stopping a few kilometers short of the Yalu would still leave a rump North Korean state whose mere existence would irk the South Koreans to no end, right? I can imagine that Seoul would demand the full eradication of the North Korean state, but would they be dissuaded if the US had heeded the many warnings about China's willingness to got war?