Mesopotamia 4000-3500 B.C. (modern-day Iraq), Ancient Egypt 3100-3000 B.C., Indus Valley Civilization 2500-1700 B.C., and ancient China 1600-1100 B.C.
All of these civilisations developed agriculture, allowing them to produce an abundance of food and feed vast populations.
They created cities that served as hubs for trade, administration, and culture, established religious ideas & practices.
They also created writing systems to retain records and communicate with one another.
They also established social hierarchies, with various classes of people having varying rights and obligations.
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