The notable figure recognized for his leadership during the American Civil War is Abraham Lincoln. As the 16th President of the United States, he played a crucial role in navigating the nation through its divisive conflict from 1861 to 1865. Lincoln's commitment to preserving the Union and abolishing slavery was evident in his Emancipation Proclamation, which transformed the war into a fight for freedom. His leadership and vision for a reconciled nation have left an enduring legacy in American history.