What a strange little man you are.... Why bring up such a topic followed with very little facts to support your own weird theory?
The US is in the middle of a GFC (Global Financial Crisis) that seriously effected the fat cats of the US who had been bolstering the US economy. The US banks were a major contributor to the downfall in the way that they handled (handed out) loans. Once it became apparent that the way the loans worked and the realisation that they could never be properly repaid, nor could they actually make money off of them, the banks began bailing out which in turn led to the collapse of the stock market.
Another reason that the US is struggling to regain it's footing is due to the unpopular "police actions" currently taking place within the Middle East. The rest of the world doesn't want to be lead by a country that looks (possible is) like it's going to war for their own financial gain, or in the case of the Iraq/Afghanistan, Oil.
Now I could be completely wrong on any or all of the above, but this is how you should have approached the start of this thread, with sound opinions followed by logic.
China has nothing to do with it, the world has been buying cheap products from China for decades. Also China is a major manufacturer for a lot of products designed and marketed by US companies, such as Apple, Old Navy, Wal-Mart, etc... Even other countries/companies from around the world have their goods manufactured there. And why do they do that? Cheap labour. If the rest of the world could compete in this area you'd find that these companies would move their production closer to home. Ford, GM, Chrysler, all had plants in Mexico, if they haven't closed them down, because it was cheaper, labour wise, to build cars down there and transport them to the rest of the world than it was to build them in the US.
The manufacturing and importing/exporting goods from overseas has been occurring for a long time and has nothing to do with the US's financial or global down fall.