There are a number of reasons. Not all of these apply to every city.
– Transport: Before railroads, most things were transported by water. Being on a river could make getting your crop to market a lot easier.
– Water: Water for drinking and water for crops is usually a lot easier to get at the bottom of a valley than at the top of a mountain.
– Better soil: Rivers and streams often leave behind areas of rich soil for growing crops.
– Flatter ground: Areas that have flooded in that past can often be relatively flat due to the buildup of material left after the floods. It’s easier to build on flat ground.
– More pleasant climate: If in a hot dry region, it can bee cooler with trees for shade in the valleys. If in a region that gets cold and snowy, the mountains are likely to be colder, snowier, and windier than the valleys.
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