Sargon the Great is actually known for founding the Akkadian Empire and is not specifically credited with establishing the city of Uruk. Uruk is one of the oldest cities in Mesopotamia and is often associated with the early Sumerian civilization. It was indeed a significant urban center long before Sargon's time, flourishing particularly during the Uruk period (around 4000–3100 BCE).
Sargon, who reigned around 2334–2279 BCE, is famous for unifying the city-states of Sumer and establishing one of the world's first empires, with Akkad as its capital. His conquests helped to spread Akkadian culture and language throughout the region, but Uruk remained a distinct city with its own rich history and cultural significance prior to and during Sargon's reign. If you would like more information about Sargon or Uruk, feel free to ask!