“Immigration to the United States, 1789-1930, is a web-based collection of selected historical materials from Harvard’s libraries, archives, and museums that documents voluntary immigration to the US from the signing of the Constitution to the onset of the Great Depression…Concentrating heavily on the 19th century, Immigration to the United States, 1789-1930, includes approximately 1,800 books and pamphlets as well as 6,000 photographs, 200 maps, and 13,000 pages from manuscript and archival collections.”