USA!
It's extremely unlikely any one country can catch us in terms of wealth or power.
I have a hard time not laughing at this comment. That's what the Romans said a WHILE BACK, iirc.
How long did the Romans last? 500 years, and that's just their 'Empire'. Counting the earlier Republic, they were around for a millenium. And the remnant Byzantines were around for a thousand years after that. So the US isn't going to disappear anytime soon, if you use the Romans as an example.
A mildly tongue-in-cheek approach to what DanielX said. "Rome fell.
Yeah, after about a thousand years. At that rate, the United States will survive well into the second half of our new millennium. Woohoo! USA! USA! USA!
Sorry. The point I should be making is that it's a mistake to cram the thousand year rise and fall of the Roman Empire into the four (or eight) years of the Bush administration. Rome wasn't built in a day. You can quote me on that.
One final nitpick. The syndicated columnists liken the US to the Roman Empire at its decadent peak, the Rome of Russell Crowe, when the better comparison is to Rome at the end of the Second Punic War."