The Pan-American Exposition of 1901 was the launching point for some of the world's greatest innovators and their life-changing inventions. It took place at Rainbow City (located in Buffalo, New York), a wonder of light and color among technological marvels and architectural genius. However, amid the joy and the triumph of science, Rainbow City and the Pan Am Expo of 1901 earned a darker reputation as well. It was there, on the sixth of September, that President William McKinley was shot and mortally wounded. A spectator, and the son of a former slave, named James Parker, who had come to the...