For example, why hasn't China invaded the USA yet? Perhaps they are waiting until they get their ~$4T back! :) theoretically it is fairly easy to repay those $

For example, why hasn't China invaded the USA yet? Perhaps they are waiting until they get their ~$4T back! :) theoretically it is fairly easy to repay those $4T. you would need some large container ship to transport all of them back to China, but a lot of those go back over Pacific fairly empty anyway.