Could China attack US? Why would US try to attack China in asia? Not an expert but that feels like losing proposition. I think people confuse proxy wars with wars. US is under no threat of being actually attacked.
It counts as an attack, but how close was US to actually being taken over? Usually when you fight a war the real risk is that you cease to exist as a country. I know nothing about war strategy, but seems to me US is in a great position as long as you get along with Canada and Mexico.