Abraham Lincoln served as the 16th President of the United States during the American Civil War. Abraham Lincoln was in office during perhaps the most critical time in the nation’s history and provided exceptional leadership. Lincoln is remembered as a man of wit and strategic vision. Abraham Lincoln’s Gettysburg Address is among the nation’s most treasured documents of freedom along with his Emancipation Proclamation, effective January 1, 1863, which freed slaves in territories in revolt against the United States. Abraham Lincoln was mortally wounded by assassin John Wilkes Booth on April 14, 1865, and died the following morning at the age of 56.