city-states such as #Uruk in #ancient #Mesopotamia , which became increasingly urbanised from around 6000 years ago. Estimates of Uruk's population vary wildly, but, by around 4900 years ago, it is thought to have housed more than 60,000 people, making it one of the oldest cities in the world.

Great #Ziggurat of #Ur building. Royal #Tombs included grand #treasures and wealth from various locations. Thousands of cuneiform texts- evidence of complex society and systems. Complex irrigation and water management systems.