There are many reasons for this, but many historians point to three patterns in the fall of civilizations: internal change, external pressure, and environmental collapse.
Many civilizations have flourished and then failed or fell apart. There are many reasons for this, but many historians point to three patterns in the fall of civilizations: internal change, external pressure, and environmental collapse. The fall of civilizations is never the result of a single event or pattern. Sometimes, civilizations seem to “disappear” entirely.