Their land was taken over, as was their food source, making it hard for them to survive. They did not have the same rights as Americans either until 1924. They were forced to live on reservations.
Answer:
The Mississippi River is the main river transportation system in the nation, and back in the Civil War, this river was even more important for transportation.
Explanation:
The North could now transport troops and supplies deep into the center of the Confederacy.