Question

During the Civil War, both sides wanted to control the Mississippi River because it was
an important source of water for cities.
a major supply route that divided the South.
the only route inland for the Union Navy.
a major port for ships arriving from Europe.

Answer 1

a major supply route that divided the South.

Controlling the Mississippi would cut Confederate territory in two, disrupt Southern supply lines and communications, and give the Union a major transport route for troops and supplies (e.g., capture of Vicksburg).