Abraham Lincoln I believe had the biggest impact on the united states. He was the 16th president and though he wasnt president for the hole term that he could be because of his assassination he still opened peoples eyes about slavery. He was a inspirational person to the majority oh people around him. After Lincoln was killed the united states started to change a lot.
Lincoln's leadership, the way he helped others, and his committment that made it possible for America to find its way through the Civil War, and then to begin the healing