ShernCarissa, Chapter 11, Question 6

I have always wondered how the US was so strong but yet had such extreme debt, I found the example of the farmers: Farmer America and Farmer China.   The most interesting because it just shows how ridiculous and symbiotic the relationship between the two countries are.  Because China allows America to get keep on borrowing and borrowing fund and giving China IOUs.  That debt has now gone beyond a trillion dollars.  Why is China still giving the US so much money when the US has nothing to give them back because we use all of our own resources?  When will we end this unhealthy relationship?