Gaining control of the Mississippi River during the Civil War would allow the North to isolate three confederate states.
Control of the Mississippi River during the American Civil War meant an economic and psychological factor for both the North and the South.
When Vicksburg fell to Union troops on July 4, 1863, the Confederacy lost its last oportunity to control the Mississippi River.
The American Civil War was a civil war fought in the United States from 1861 to 1865, between the North (Union) and the South (Confederacy).