Why is the wall integral to the earliest cities?
Earliest urban communities were surrounded by nomadic people coming and going
Wild animals were common during early urbanization in most places
Cities were known to have food and water, so in times of scarcity nomadic people often tried to raid cities
As more cities developed, their kings began to lead raids on other cities for plunder, slaves, and territory
Walls might have helped control slaves and other urban residents who were less than willing to cooperate with the king and his forces