The U.S. is supposed to have more physical gold than everybody else, but in many articles I've read they claim they don't know how much they actually hold. A big government secret I guess.
The issue IMO is if the dollar crashes at some point in time, what happens then? I can't see the world trading strictly in gold and if there is a dollar crash most likely we see other currencies crashing also. There's not a time in history where all the major currencies are in such bad shape and unfortunately the U.S. is not the nation it once was, especially in a financial sense. We're broke.