What will happen is a dominoes affect were the rest of the world will start collapsing and at the end the U. S. will collapse. All investors are moving there monies to the U. S. They are investing in real properties like condos and commercial properties. They know that when the collapse happens all over the world even they properties here will go down but that in the end the U. S. will have the capabilities to restate easier and better then many other counties.
This may happen or may not happen depends what type of government we get after the collapse. Who knows but these investors see the U. S. as a better bet.