After its fall, circa 2000, Mesopotamia was divided between a series of kingdoms, Isin, Larsa, Eshnunna, Assyria, etc., with Mari and various local powers in lands farther north and west.
This situation lasted until the eighteenth century, when Hammurabi of Babylon eliminated most of his rivals.
William Petrie, in his book Egypt and Israel (Petrie 1911, p. 1320–1260/1250 and the Exodus around 1260/1250 and uses a 645 year period between Abraham and the Exodus. However, the result of recent research is that the chronology of the ancient world is being redated. Hammurabi now appears to be a near contemporary of Moses instead of Abraham. Mesopotamia was one of the earliest regions to be inhabited after the great Flood, and it was here that Abraham lived his early life. In addition to this, it was from the region of Mesopotamia and other eastern nations that a coalition of kings fought against Sodom and Gomorrah and kidnapped Lot, Abraham’s nephew.