American Memory Project
Developed by the Library of Congress, this is a searchable database that includes motion picture collections, such as the Edison Companies and Early Animated Films, and there are films on special topics, including "Before and After the Great Earthquake and Fire: Early Films of San Francisco, 1897-1916", "Theodore Roosevelt: His Life and Times on Film", "America at Work, America at Leisure: Motion Pictures from 1894-1915", "The Spanish-American War in Motion Pictures" and more.