Could America defeat the rest of the world if no nuclear weapons were allowed?

We do have a lot of weapons but not that much population, depends on what kind of war it is too. Between China and India they have almost half the worldwide population, we have barely 10% of that. Wars are not won by weapons alone, as the Germans learned in WWII, you need food, fuel, materials to win a war and you need to be able to get all of those to the battlefield too.