Final answer:
The Mississippi River was significant during the Civil War because it provided water for cities, served as a major supply route that divided the South, and functioned as a major port for ships arriving from Europe.
Step-by-step explanation:
The significance of the Mississippi River during the Civil War was multifaceted:
- It provided water for cities: The river was an important source of water for cities along its banks.
- It was a major supply route that divided the South: Controlling the Mississippi River would have given one side the advantage of cutting off the other from vital supplies.
- It was a major port for ships arriving from Europe: The river served as a crucial port for ships arriving from Europe, which allowed goods to be transported inland efficiently.