United States President William McKinley stands by a flag-draped podium at the 1899 Lincoln Douglas Debate anniversary celebration at Knox College.

William Howard Taft addresses the crowd at the 1908 Lincoln-Douglas debate celebration. Harold Way notes that he copied this photograph in 1937 from an original produced in 1908.

President William McKinley and cabinet with Colonel Clark E. Carr on the steps of Carr's home in Galesburg, Illinois at the time of the Lincoln-Douglas debate celebration.

William Howard Taft, Republican candidate for president of the United States addresses the crowd at the 1908 Lincoln-Douglas debate celebration.

The slide reads: "Peoria Courthouse 2/3/78. 1978-75-17." The photograph shows a plaque at the Peoria County Courthouse marking the sites of one of the Lincoln-Douglas debates. The sign reads: "Near th…