Question

my question is, how do CITIES work?

Answer 1

Answer:

Cities need to provide basic infrastructure services—clean water, sewage, roads, electricity, telecommunications, to name a few—to support the basic livelihood of their citizens and businesses.

Answer 2

As time marched on, more and more cities were founded around the world. ... Rather than a center of agriculture or manufacturing, these cities were large marketplaces focused on trade. Such cities often formed where goods would move from one mode of transportation to another, such as at a river or ocean port.