During the Civil War, key waterways in the South included the Mississippi, Ohio, and Tennessee rivers. the Great Lakes and the Mississippi River. the Ohio, Tennessee, and Columbia rivers. the Great Lakes and the Columbia River.

Mississippi, Ohio, and Tennessee rivers.

Explanation

The waterways were important during the war. This was because the waterways helped in the delivery of different types of supplies for the country and for its military. The waterways also helped in the movement of military man power during the war. Any country who has issues with its waterways was in deep trouble of lacking basic items for its citizens and being ambushed if possible.

The South used the Mississippi, Ohio, and Tennessee rivers during the war.

mississippi, ohio, and tenessee

Explanation: