I think that the problem in the USA is actually quite different than your scenario. I believe that America - especially the American economy is spiraling toward an almost medieval situation, wherein all the wealth and power is controlled by a tiny elite group and all the rest (the "99%") are slowly being stripped of their financial well-being.
It's my opinion that soon the economy will become so unbalanced that an actual revolt could occur. I see the "Occupy Wall St" protests from a couple of years ago as the rumblings of massive discontent.
The two party political system in the USA has become a joke. The politicians are bought and paid for by the elite and do their bidding.
CyrusThePersian