University of Houston Digital History This link opens in a new windowIncludes over 400 annotated documents from the Gilder Lehrman Collection, supplemented by primary sources on slavery, Mexican American, Asian American, and Native American history, and U.S. political, social, and legal history; succinct essays on the history of film, ethnicity, private life, and technology; multimedia exhibitions; and reference resources that include a database of annotated links, classroom handouts, chronologies, glossaries, an audio archive including speeches and book talks by historians, and a visual archive with hundreds of historical maps and images.