Hah, good point! In the case of China they're likely to peak soon. The USA might peak much later still. The Roman empire lasted over 1000 years. I have my doubts the US can go the distance, but let's see.
Treating all the things that were called "The Roman Empire" as one thing is a pretty big stretch. Modern nations have much more rigid and well-defined natures.
Treating all the things that were called "The Roman Empire" as one thing is a pretty big stretch. Modern nations have much more rigid and well-defined natures.