No,And not because of nuclear power If a war did break out between the U.S and China it would be a sea battle
1. The U.S has The best navy in the world! By far!
2. China is very weak over sea,But if China somehow got to U.S soil then they might have a chance.
3. The U.S has to many allies in the pacific such as Australia, Canada, And maybe Japan
4. China will have a hard time projecting boats out!
P.S All you people that think the war would end up nuclear your wrong the u.N wouldn't approve of it! To fire a nuke at China or the U.S, it would need to be a world war and it wont get that far because they are two world superpowers it would be quick.