Which does not describe a benefit enjoyed in the mid-1800s by american cities that grew up along rivers?

Although you didn't include any options t choose from, I found that the major benefits enjoyed in the mid-1800s by American cities that grew up along rivers are water power for mills and factories, transportation by steamboat, and drinking water. One major benefit they didn't enjoy however, was hydroelectric power.

The american civil war

It covered the territory of land across eurasia from northeastern europe to the pacific ocean.