This is the only country in the world that I can think of where anyone can be or become an American. It's a way of life, not a nationality, and that may be it's greatest strength; in any other country you can become a citizen, but never a nationality.
I can get German or Greek or French citizenship, but I will never become German or Greek or French, just by having citizenship papers. When I identify myself as to origins, I never say "American' I say "half French Canadian, part Dutch, part Irish". Even our first citizens, the Native Americans, define themselves by tribe, or nation.
To my mind, that's pretty cool.
I wonder why people are so surprised when the bottom falls out of the ecomonic laundry basket. It happens every thirty years or so, in a boom-and-bust fashion, and has been doing so for a very long time. You would think by now we'd know enough to be prepared for it, or at least not be surprised when it happens again.