Why didn't the Sumerians live longer?

The Sumerians faced several challenges that contributed to their relatively short civilization span, including environmental factors like unpredictable flooding and droughts that affected agriculture. Additionally, political fragmentation and conflicts with neighboring regions led to instability. Social factors, such as class disparities and potential internal strife, may have further weakened their society. Ultimately, these elements combined to hinder their longevity as a civilization.