Biscuit...
Will the U.S. be around in a thousand years?
Highly unlikely. It will become (as you said) like the Roman Empire.
Why? Because we are losing the edge because of the middle.
No one today seems to think of the U.S. as an answer to anything. Instead, they prefer to complain about how bad things are. Patriotism is dead in this country. And like Rome, when you achieve the height of greatness, where do you go? If the people will not carry the center onward, it begins feeding upon itself.
We have the greatest country in the world. But we take it for granted. And so, the center will spin so fast that the edges lose grip. And one thousand years from now, you will see unrecognizable countries occupying this land mass.