this post was submitted on 04 Jul 2025
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It isn't though, I have seen the original source of this claim and its bs. The author just picks and chooses when empires begin and end so that it fits their claim. I would concede the point if it were ever actually an average.
It's not just Glubb. The Changing World Order by Ray Dalio also arrives at the 250 year number.
Cliodynamics and Structural-Demographic Theory suggests cycles of 200-300 years as well.