Why are cities often built in valleys instead of on mountains?

Question

Why are cities often built in valleys instead of on mountains?

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Answer 1

Cities need to be built and stay connected. It is harder and more expensive to build the more uneven the terrain is. And cities benefits from having rivers nearby because transportation on ships is (or at least used to be, nor sure if trains aren’t better now) the cheapest and easiest way of transporting large amounts of cargo. Rivers in the mountains are useless for ships