It's already too late for the US to win a war against China. If they wanted to win, they needed to initiate it back around 2020.
The PRC is a very fragile dictatorship, approaching the levels of the Aztecs. (i.e. 400 guys with horses can win because everyone except the royal family and their bodyguards wants them to win).
TL:DR; The powerful can keep making more and more enemies and it doesn't matter right up until the minute it does.
You remove PRC and you basically described the US Empire