On july 4, 1863, general ulysses s. grant defeated the confederate army at vicksburg, mississippi, and the union took control of this city. why was this an important victory for the union?

Becuase it was the remaining Confederate invasion of the North, after defeating them at Gettysburg they once again defeated them at Vicksburg, Misssissippi,the victory gave them control of the Mississippi river.

The Union then had control of all of the Mississippi River

Explanation:

During the Civil War, one of the goals of the Union Army was to take control of the Mississippi River because it was a major transportation route. Also, by controlling the Mississippi River, the Confederate states of Texas, Louisiana, and Arkansas were cut off from the other states in the Confederacy. The Union Army achieved its goal of controlling the Mississippi River with its victory at Vicksburg.

d

explanation:

i think that this is the best answer, but im sorry if this is wrong