Final answer:
Grant's victorious siege of Vicksburg gave the Union complete control of the Mississippi River and divided the South in half.
Step-by-step explanation:
Yes, Grant's victorious siege of Vicksburg gave the Union forces complete control of the Mississippi River, which achieved the Union goal of dividing the South in half. Vicksburg, located on the bluffs above the Mississippi River, was a major Confederate stronghold. The Union's capture of Vicksburg was a significant blow to the Southern war effort and allowed the Union to control a vital water route.