The Battle of Vicksburg was significant because

It was significant because it allowed the Union army to take control of the Mississippi River from the Confederacy.

The Battle of Vicksburg was significant because it allowed the Confederates (southern states) to lose control of the Mississippi and Mississippi River, which was extremely important to the Confederators.

Explanation:

The Battle of Vicksburg took place from May 18 to July 4, 1863, during the American Session War. At the time, the Union army forced the Confederate army back on the Mississippi River. The violent battle ensured the union, control of the Mississippi and the Mississippi River, while the Confederate army was extremely weakened by severe casualties during the battle. Historians believe that it was from this moment on that the already tired and massacred Confederates became aware that they could not win the war of the Session.