How did Babylon become a major power after the fall of Ur?

Following the fall of the 3rd dynasty of Ur, Babylon transitioned from a provincial center into the nucleus of a small kingdom established in 1894 BCE by the Amorite king Sumuabum. Over the following century, his successors gradually consolidated the city's status and influence.1

Babylon’s rise to becoming a major power was primarily driven by the sixth king of this dynasty, Hammurabi (reigned c. 1792–1750 BCE). Hammurabi transformed the small city-state into a large territorial empire by employing several key strategies:21

• Military Conquest: He conquered surrounding city-states, including Larsa, Uruk, Isin, and Eshnunna, eventually bringing all of southern Mesopotamia and parts of Assyria under his control.321
• Strategic Resource Control: Hammurabi skillfully managed the Euphrates water supply, often using it as a weapon by damming or diverting water to defeat rivals or force their submission.2
• Diplomacy and Consolidation: He navigated a complex landscape of shifting alliances and used his reign to fortify borders and implement administrative changes, establishing Babylon as the primary commercial and administrative center of Babylonia.21

These efforts shifted the center of Mesopotamian political power from the south to the north, where it remained for over 1,000 years.32