* Abraham Lincoln: The president of the United States during the Civil War, Lincoln led the Union to victory and issued the Emancipation Proclamation, which freed enslaved people in Confederate territory.
* Jefferson Davis: The president of the Confederate States of America, Davis was a former United States senator and Secretary of War who led the Confederacy during the Civil War.
* Ulysses S. Grant: A Union general who led the Union to victory at the Battle of Vicksburg and later became president of the United States.
* Robert E. Lee: A Confederate general who led the Army of Northern Virginia and is considered one of the greatest generals in American history.
* Stonewall Jackson: A Confederate general who was known for his aggressive tactics and was considered one of the most brilliant generals of the Civil War.
* William T. Sherman: A Union general who led the Union to victory in the Atlanta Campaign and later became known for his "scorched earth" tactics.
* George B. McClellan: A Union general who led the Union to victory at the Battle of Antietam and was later relieved of command by Lincoln.
* Ambrose Burnside: A Union general who was defeated by Lee at the Battle of Fredericksburg and later replaced by Hooker.
* Joseph Hooker: A Union general who was defeated by Lee at the Battle of Chancellorsville and later replaced by Meade.
* George Meade: A Union general who led the Union to victory at the Battle of Gettysburg and later became the commander of the Army of the Potomac.
These are just a few of the many important leaders who played a role in the American Civil War. Each of these leaders had a significant impact on the course of the war, and their decisions and actions helped to shape the outcome of the conflict.