Which battle is considered to seal the defeat of the South in the Civil War, occurring the day after Gettysburg?

The Battle of Vicksburg, fought from May 18 to July 4, 1863, is a critical turning point in the American Civil War. It effectively sealed the fate of the Confederacy by giving the Union control over the Mississippi River, which was a vital transportation and supply route. The Union's victory at Vicksburg occurred just after the significant Union victory at Gettysburg, which not only halted the Confederate invasion of the North but also shifted the momentum firmly in favor of the Union forces.

By capturing Vicksburg, General Ulysses S. Grant divided the South, preventing supplies and reinforcements from easily moving between the eastern and western Confederate states. This dual defeat of Gettysburg and Vicksburg marked a significant decline in Southern morale and military efficacy. The Confederacy struggled to recover from losses and diminishings in resources, implying and establishing Vicksburg's importance as a decisive factor in sealing the South's fate in the Civil War.