Without any allies, China would probably win... because of its big number of people and technologies.
China
US Military.
China would win. China has more soldiers, bigger armies, better technology, and strong/growing allies.
The US will not go to war with China for the simple reason they fear them. China is a smart country, give them points for that. China knows how and where to make its plays. The US doesn't have the military or political power to fight China. The US is a very war experienced country and is trained in fighting long bloody wars as long as the citizens like the wars caused. The US donesn't have anything against China. Actually, the US and China should be friends... but things aren't like that.
The US has the world's most powerful military. USA wins.
China has sheer numbers. You decide. [China because the US relies on China economically and for their military, since the US uses the money China give them to buy military weapons, and they buy weapons from them.]
china
US hands down Deffinatly the U.S The US would beat Russias coldwar era tech.
The US would never fight a conventional war with China or Russia, but might support a country that did (as with Afghanistan from 1979 to 1989). Russia has a much larger conventional army, and China an even larger one. Any armed conflict would likely lead to a nuclear exchange, either limited or total. Russia has parity with the US in nuclear weapons, while China is still a distant 3rd.
The u.s would actually win because they are the ones with the tech and strength. Yes China has a big army but they are only low quality. America has more tanks, larger air force and its army is more equipped to deal with China
no we would be blown off the face of the earth
The US and China are not at war so this question is unanswerable.