There’s a podcast called “Fall of Civilizations” which does episodes about exactly this. They collapse for different reasons, of course. Invasion by a superior military force is one obvious way to end a civilization, but internal troubles also happen.
This episode talks a little about the problems of empire, starting at this time link: https://www.youtube.com/watch?v=GfUT6LhBBYs&t=870s
But you might just want to watch all of them because they’re pretty good.
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