The US could never beat China. Just think how many Chinese restaurants there are in the US, and many of them probably employ military "sleepers". Another problem would the the electronics in the US weapons - isn't much of it Chinese? Then of course there is the problem of rare earths - the Chinese control that market, and the US needs a good supply of rare earths for its electronics and weapons.
There cant be any winners in a wars between U.S, Russia and China.All 3 countries are too big and they have nuclear missiles, therefore even if someone of those 3 starts WW3, it wont end up well for anyone.These big countries having nukes keep this status quo.