The Roman Republic lasted 500 years, followed by the Roman Empire for another 500 years.
200 years would be the length of Pax Romana, which is a period of no wars around the Mediterrean Sea due to the complete military dominance of the Roman Empire.
One of the other posters mentioned civilizations that also had long lifetimes.
=============================== The father of the U.S. environmentalist was George Perkins Marsh, who wrote "Man and Nature" during the Civil War...was published 144 years ago.
One of his key points was the decline of other major civilizations was linked to the collapse of their agricultural system, primarily do to erosion.
The United States continues to sit on not only outstanding stockpiles of non-renewable resources like coal, oil, and iron...but we have done the finest job in history on managing our renewable resources.
Yes, we can do an even better job, too. Far from declining agriculture that has led to collapse of other civilizations our agricultural trends have been to use less land to grow more food.
People worry about us owing money to China...we have far too many natural resources to worry about that.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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