Your other comments in this thread discount the actual length of time other empires that lasted longer than 250 years held power, and extend the length of time

Your other comments in this thread discount the actual length of time other empires that lasted longer than 250 years held power, and extend the length of time the U.S. has held empire-like power around the globe. While you might be right that the average is 250 years, the variance is high, and your arguments to defend your position are weak.