The US doesn't have much debt (public or private) denominated in currencies other than the US Dollar, so the government can only go bankrupt if the Fed makes the political decision to let it go bankrupt.
However, the US is a net importer so a collapse of the dollar would be painful for consumers. En un viejo país ineficiente, algo así como España entre dos guerras civiles, poseer una casa y poca hacienda y memoria ninguna. -- Gil de Biedma
