https://nemets.substack.com/p/crisis-of-the-23rd-century
Civilization is old - at least 11,700 years old - and has risen and fallen at least six times. Each of those falls was an apocalypse in the biblical sense. Cities were destroyed or abandoned, productive lands were turned into deserts, cultural sophistication regressed to primitive artisanry, barbarian warlords overthrew law, and human populations fell dramatically. ...
https://nemets.substack.com/p/seven-ages-of-western-eurasia
this is about six major falls of civilaztion