The Romans actually had quite a bit of staying power. The legendary founding of Rome is 753 BC (or is it 752? I'm too tired to hunt it down right now) and the most often cited date of the fall of Rome is 476 AD. 1,000 years is nothing to sneeze at, roughly half of which was spent ruling over large areas of land. If you read up on the Pax Romanum, I'm sure you'll find that it actually was a quite calm period, even by today's standards. After having emerged from a century of civil war, Rome came out shining under Augustus. At this point in time, I think it's safe to say that Rome was a greater power than the US. They ruled a good portion of the known world and had what I would consider better administration techniques (e.g. live and let live, not the forced indoctrination into a non-native culture that we seem so eager to do to others - e.g. Native Americans). The US is still in its infancy, and only time can tell what will happen from here. We had a long gestation period from the 1600s to 1941, and since our entrance as a major player on the world stage, we've experienced a rapid escalation in power and influence. However, this is already starting to backlash. Perhaps we will still be around 600 years from now, perhaps not. If future generations look back on us, and compare us to the Romans, I would view that as a compliment towards our greatness. However, there exists the chance that we are nothing but a flash in the pan (and yes, nuclear weapons have made this a distinct possibility - we may be the engineers of our own demise). As far as Rome having expanded too far, too fast, I'd say that doesn't hold a whole lot of sway. They were the most efficient administrators of the ancient world, which allowed them to deal with issues of scale that arose. It's not the expansion that directly did them in, in my opinion, and in the opinion of many ancient Romans. They thought that their society suffered as a result of corruption caused by a corrosion of traditional values. Some of this supposedly was the result of new ideas that were introduced to Rome from the foreign cultures that they encountered. The Romans tried to counter this threat in numerous ways - Augustus implemented moral codes, later emperors persecuted Christians, etc. We'll I'm off to bed now....