The world economy isn't a zero sum game, poker is. If it was, we'd all be fighting over the two chickens and a wildebeest that the first 2 humans had.
You can't just look at one side of the balance sheet. Until you consider the assets, you have no way of telling whether a country is "in the red".
It comes from central banks, and none of it is "money." It is fiat currency, and it has no intrinsic "value." If you want to retain some sanity about this subject, learn to think gold and silver.
Which also is a completly arbitrary thing to tie the world's currency supply to and also has very little intrinsic value. It's insane to live in a world where we have money supply expansion because of the discovery of a new gold deposit and stagnation if no new supplies are found, that's pretty much the opposite of sanity.
Don't forget the fact that most imports from China - finished goods of US companies. There is nothing to fear Chinese economy is highly dependent of US.. Moreover US debt is nominated in national currency and all world bank hold reserves in US Dollars. US will continue to push papers to those third world countries getting real resources instead.