Pan-American Exposition was a World 's Fair held in Buffalo , New York , United States , from May 1 through November 2 , 1901 . The fair occupied of land on the western edge of what is now Delaware Park , extending from Delaware Avenue to Elmwood Avenue and northward to Great Arrow Avenue . It is remembered today primarily for being the location of the assassination of President William McKinley . The exposition was illuminated at night . Thomas A. Edison , Inc. filmed it during the day and a pan of it at night
assassination of President William McKinley
Assassination of William McKinley
Pan-American Exposition