Why did Northern strategists view the Mississippi River and its tributaries as vital to a Union victory in the Civil War? It kept the South from invading the North. Control of it would split the South in half. It would stop supplies from reaching the South. It would provide a safe route to Western states.

What was the purpose of the Union campaign along the Mississippi? First, the Union sought to gain control of the Mississippi River, and thereby split the Confederacy.  The Lower Mississippi River Valley was the most critical theater of the Civil War. The Mississippi River served as the major interstate highway of 19th-century America. The river enabled people to transport goods from St. Louis and Pittsburgh through New Orleans to the world.  A victory at the siege of Vicksburg, Mississippi, in 1863 gave the Union control of the Mississippi River in the American Civil War.

Explanation:

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.