Answer:
The answer is that the victory gave the Union complete control of the Mississippi River.
Step-by-step explanation:
Vicksburg’s strategic location on the Mississippi River made it a critical win for both the Union and the Confederacy. The Confederate surrender there ensured Union control of the Mississippi River and cleaved the South in two.
The Siege of Vicksburg (May 18, 1863-July 4, 1863) was a decisive Union victory during the American Civil War (1861-65) that divided the confederacy and cemented the reputation of Union General Ulysses S. Grant (1822-85). Union forces waged a campaign to take the Confederate stronghold of Vicksburg, Mississippi, which lay on the east bank of the Mississippi River, halfway between Memphis to the north and New Orleans to the south. The 47-day siege gave control of the Mississippi River to the Union, a critical supply line, and was part of the Union’s Anaconda Plan to cut off outside trade to the Confederacy.
The Mississippi River was the primary conduit for supplies and communication through the south as well as a vital lifeline for goods going north. To Confederate President Jefferson Davis, Vicksburg was the "nailhead that holds the South's two halves together."