America like all great superpowers will eventually collapse from the weigh of its own imperialism and pigheadedness...its the same with all superpowers from Rome to the 21st century. The EU is a ver good example of how one day all of Europe will be regarded as a single state, more superpowers are on their way through, one of those being China as well...and eventually I have no doubt that they will collapse as well...responding to the quote:
"QUOTE
The availability of open lands, slavery, a labor shortage in our early history, political unrest and poverty in other countries brought immigrants to the U.S. Romans were more apt to colonize overseas.
Hm I dunno, you still have a large scale mixing of populations in the form of slaves and immegrants to Italia, and particularly to Rome. Its these areas that form the tempo of political and social life in their entire empire."
You can find the same osrt of thing in america too, although they aren't called slaves what do the millions of absolute minimum wage workers in America get for their hard work, practically zip and the government doesn't seem to be doing anything about it, that was the same for Rome, not superpower can exist without the sheer manpower of a vast majority of semi-slaves.
The politics of America dont seem to be so cut-throat though, back during the days of the Republic and the Empire the political arena was a
death trap...