Immigration to the United States, 1789-1930"documents voluntary immigration to the United States from the signing of the Constitution to the onset of the Great Depression. Concentrating heavily on the 19th century, Immigration to the US includes over 400,000 pages from more than 2,200 books, pamphlets, and serials, over 9,600 pages from manuscript and archival collections, and more than 7,800 photographs." From the Open Collections Program, Harvard University Library