Which general led the Union Army during the American Civil War?

Ulysses S. Grant led the Union Army during the American Civil War and is notably recognized for his strategic military leadership that played a crucial role in securing victory for the North. Appointed as the commander of all Union armies in March 1864, Grant's aggressive tactics and willingness to engage in large-scale battles, such as those during the Overland Campaign, marked a significant shift in the Union's military strategy. His ability to coordinate multiple armies toward a common goal, while maintaining constant pressure on Confederate forces, helped expedite the end of the war. Grant's successful military campaigns culminated in the surrender of Confederate General Robert E. Lee at Appomattox Court House in April 1865, which effectively marked the conclusion of the Civil War. This pivotal leadership solidified Grant's reputation as a key figure in American history.