The very first cities were founded in Mesopotamia after the Neolithic Revolution, around 7500 BCE.
Step-by-step explanation:
I am not entirely sure because I am currently learning about this as well but I am pretty positive the early civilizations occured just after the Neolithic Revolution (also known as the Agricultural Revolution or the "New stone Age") in Mesopotamia. Mesopotamia lies between the Tigris and Euphates river and it means "the land between 2 rivers". Mesopotamian cities included Eridu, Uruk, and Ur. Early cities also arose in the Indus Valley and ancient China. I hope this helps because I am new to this :)