What changes have occurred with settlements that have become cities? For the answer, use the reference words

What changes have occurred with settlements that have become cities? For the answer, use the reference words: size, fortifications, population composition, place of religious rites.

Over time, human settlements grew in size and turned into cities. Usually an urban settlement was surrounded by a defensive system of fortifications — earthworks, Palisades or walls. The cities were inhabited by nobles who were served by artisans and slaves. Cities were the centers of social life of the tribe, from here went the wars for loot, here flowed all the wealth taken during the military campaign, here was the spiritual center — a sanctuary, a place of religious rites

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