It doesn't really matter in the big picture. How would the US look in a month or six if we by war stopped all products from China today? The US would become unrecognisable. The economy would be so destroyed it would hardly be a victory no matter what casualties says on the two sides. Even if we nuked some of our own cities we would be better off than after winning a conventional war against China. No, a war against China is unwinnable if the US of today needs to be there post-war.