9. IMHO I believe that had very very little to do with it
At the end of the day, you need to put your U.S. dollars into U.S. dollar denominated investments (unless you plan on just sticking it under the bed). There is no other major country that uses the dollar therefore the dollar has to come back to the U.S. in some shape or form
Just look at Japan- they have been downgraded a few notches and borrow at rates that are half the U.S.