The Sumerian civilization, emerging around 4500 BCE in Mesopotamia (modern Iraq), built upon the agricultural foundations of the earlier Ubaid period. This food surplus fed growing city-states, creating a pressing need for complex administration. To meet this challenge, the Sumerians invented cuneiform, the first known writing system, around 3200 BCE to track trade, law, and history on clay tablets. Their use of a sexagesimal (base-60) number system was another critical tool for organizing socie