>>509972075that's the kali yuga pattern.
1. empire rises
2. produces enough food they can mass export
3. the empires own population at it's height reproduces slowly. while the barbarians they export food to multiply wildly
4. inevitably the barbarians overwhelm the empire or it just collapses on itself.
this doesn't happen to every empire, not every empire ends up exporting food and some are just destroyed by long term weather trends, those would be different patterns.
there's some minor pattern stuff for maybe an ecological collapse but we'd have to go hard for 50-100 years as a planet to make that happen.