Lawlz, US Would lose against china, but china would lose to their selves.
The US may lose the war, but china would totally suffer from far heavier death loses, and would be weakened entirely, then i think Germany or Russia would do a sweep and attack china or USA...
Anyways, I believe the next WW3 Would be between Germany Russia USA China and then France UK Mexico Canada and all other small alliances from the other bigger nations would have to join in because of the alliances with Russia US China and other things.
The US as built up per say an Armor of Alliances almost, because we have many alliances with small countries who've we helped, we have many other branches and influential decisions that affect many countries to make them either bend our way or join our enemies, also we have probably have the most nuclear weapons at ready. The US is and always at war with someone.
P.S. Canada is built up out of Saggy used up pussies who are afraid to speak up, Canada could be like Russia and better because their close to USA they are factually the closest threat than any other countries, their just too pussified. *Cough* Lol *Cough*