China would never need to fire a shot. They could bring us to our knees by dumping all of the U.S. debt they've purchased. Of course, they'd be hurt badly by such a move (everyone would), but if the shit ever hit the fan they just might decide they could withstand the damage better than us. It's an ace up their sleeve that should give pause to any U.S. administration.
Think of it as the economic equivalent of MAD.
Think of it as the economic equivalent of MAD.