Well. That is why it is a last resort sort of thing to do but really, in the event that the USA defaults in the treasuries or simply cannot pay back and then the nation goes down as a result of its currency being completely worthless, well China along with Russia and other like minded nations can extract the payment of these investments in blood since the USA has failed to act in good faith and tried to basically live beyond its means without paying back the appropriate value. No nation is going to forgive this and should this become reality, well the USA will not be shown any mercy. The USA has a lot of debt and one way or the other, they will pay it, either though money, gold or having their lands extracted from them by force when the world has had enough of America sucking up all their resources and is weak enough.