I don't think you understand things fully and have been listening to Ron Paul too much. I did a write up that explains things in a pretty good manner without getting too long...even tho it is a little lengthy in another thread "OT

on't check your 401K balances" that was started earlier today. Go read it.
We owe China like $1.5T. Yes that's a lot, but also not enough for them to have leverage over us. Those bonds are also due in time, it's not like they all come due at once We have an $18T economy. If the US actually started to care, or our policy makers did, we could do some serious damage of paying down debt...if we wanted to. See Amazon. They have been spending erratically for years, but they make so much money, the Street gives them the benefit of the doubt and they can turn off the spending spicket and be profitable. Google just did this and their stock rallied. America could too if we had the will to do it.
Also, China depends on us more than we do on them. We have way more leverage over them than they do us. The one tool they really have is devaluing their currency more which is what Trump keeps talking about.