section_path: History
section_name: History
paragraph_text: History
  
  The Sumerian city-states rose to power during the prehistoric Ubaid and Uruk periods. Sumerian written history reaches back to the 27th century BC and before, but the historical record remains obscure until the Early Dynastic III period, c. 23rd century BC, when the language of the written records becomes easier to decipher, which has allowed archaeologists to read contemporary records and inscriptions.
  
  The Akkadian Empire was the first state that successfully united larger parts of Mesopotamia in the 23rd century BC. After the Gutian period, the Ur III kingdom similarly united parts of northern and southern Mesopotamia. It ended in the face of Amorite incursions at the beginning of the second millennium BC. The Amorite "dynasty of Isin " persisted until c. 1700 BC, when Mesopotamia was united under Babylonian rule.