Why did ancient civilizations fail?

Ancient civilizations often failed due to a combination of factors, including environmental changes, resource depletion, economic decline, and social unrest. Natural disasters like droughts or floods could devastate agricultural production, while overpopulation and poor resource management strained their systems. Additionally, internal conflicts, invasions, or political corruption weakened their structures, leading to eventual collapse. Ultimately, these interconnected issues created unsustainable conditions that civilizations could not overcome.