It is unclear from which public speech the quotation on this envelope originates. Abraham Lincoln (February 12, 1809 - April 15, 1865) was the sixteenth President of the United States. As Commander in Chief of the United States, he led the Union during the Civil War. On April 15, he was shot in the back of the head at Ford's Theater by John Wilkes Booth. Lincoln died shortly thereafter. About the Creator: The main proprietor of J. M. Whittemore & Co. likely was James M. Whittemore, a Boston-based publisher that operated during the American Civil War.