It ends in global financial collapse. Then rises again! The US will gradually fade from dominance as every other leader before it. I wouldn't be surprised if we're witnessing it's decline right now. I don't see how it gets out of the major systemic mess it is in. Detroit, Louisiana, etc. is how it begins. A first world country bit by bit reverting to third-world status.
Until some place has a successful anarchic-type revolution (a la Spain & Paris) without an outside power coming in to overthrow them we're stuck with this legacy economic/political system and the best we can do is civilize it with prudent regulation (which we can barely do because it's been systemically corrupted).
Corruption and regulation are fast friends which usually encourage each other.
In this day and age, sustaining life should not require 40+ hours of work per week.
As a society we are producing a ridiculous amount of surplus, and then conditioning ourselves to consume that surplus so that we can produce even more.
Where does it end?