“collapse followed quickly after the leaders of these polities inexplicably and suddenly abandoned principles and practices that had successfully underpinned state-building and social stability”

https://www.nationofchange.org/2024/09/04/political-collapse-lessons-from-fallen-empires/

“China’s Ming Dynasty, the South Asian Mughal Empire, the High Roman Empire, and Renaissance Venice … the loss of citizen confidence in the leadership can trigger an unexpected unwinding of the societal threads that underpin inclusive forms of cooperation and devotion to a governing system designed to realize common good”

This topic needs more research but the short paper reminds us great empires can collapse very quickly for no obvious reason. Civilization is not a very stable condition.