You're getting over-excited. The US has a vested economic interest in China that despite rhetoric, it cannot extract itself from immediately, maybe not even in

You're getting over-excited. The US has a vested economic interest in China that despite rhetoric, it cannot extract itself from immediately, maybe not even in ten years. It doesn't have that entanglement in Iran. Trying to crash China's economy is in shooting-own-foot territory, and trying to do it by reneging on Treasury securities that are a part of complex financial transactions (they might be lent out, have you thought of that?) must be the dumbest way of all.