Hard to say, I think it would almost be kind of funny to find out that the rest of the world was completely untouched by the nuclear war between the US and China.
Impossible.
#1: That many nukes going off would do
terrible things to the rest of the world'd climate/atmosphere.
#2: America's 'credit crunch'/'recession' had/is having a sizable impact on the world economy. What do you think would happen if we simply disappeared as a global player one day? Complete melt-down. Same for China. If we returned fire and did to China what is done to America in FO that'd also destroy the world economy. If even one of the 1st world nations simply vanished one day the rest of the world would go to [censored].