What civilization fell because of internal conflict?

The Western Roman Empire is a prime example of a civilization that fell due to internal conflict. Political instability, including power struggles, corruption, and civil wars, weakened the empire's ability to respond to external threats. Additionally, economic troubles and social unrest further exacerbated divisions within society, contributing to its eventual collapse in 476 AD. This internal strife paved the way for invasions by barbarian tribes and the fragmentation of the empire.