Research and editing by Sam Holmes and Charles Reynolds. (1) From Nova Britannia by Robert Johnson (London, 1609), courtesy of the Rare Book Division, New York Public Library. (2) From Ausfuehrliche Historie der Emigranten oder vertriebenen Lutheraner aus dem Ertz-Bissthum Salzburg (Leipzig, 1732-34), courtesy of the Rare Book Division, New York Public Library. (3) From Your America Day-by-Day by Clark Kinnaird; copyright 1950, King Features Syndicate, Inc. (4) From White Servitude in Colonial South Carolina by Warren B. Smith, courtesy of University of South Carolina Press. (5) and (6) Courtesy of the New-York Historical Society, New York City. (7) From To the Golden Door by George W. Potter, courtesy of Little, Brown and Company. (8) The Bettmann Archive. (9) Courtesy of the Library of Congress. (10) Culver Pictures, Inc. (11) The Bettmann Archive. (12) Harper’s Weekly, June 6, 1863. (13) Courtesy of the Nebraska State Historical Society. (14) Courtesy of the Minnesota Historical Society. (15) Courtesy of the Weyerhaeuser Company. (16) Brown Brothers. (17) Courtesy of the Museum of the City of New York. (18) Courtesy of the Library of Congress. (19) Brown Brothers. (20) and (21) Lewis W. Hine, courtesy of George Eastman House. (22) Culver Pictures, Inc. (23) Courtesy Library of Congress. (24) Lewis W. Hine, courtesy of George Eastman House. (25) and (26) Brown Brothers. (27) Lewis W. Hine, courtesy of George Eastman House. (28) Brown Brothers. (29), (30), (31) and (32) Courtesy of U.S. Immigration and Naturalization Service. (33) Courtesy of Polish Museum of America, Chicago. (34) Arnold Genthe, courtesy of the California Historical Society. (35) Courtesy of U.S. Immigration and Naturalization Service. (36) Brown Brothers. (37) Lewis W. Hine, courtesy of George Eastman House. (38) From the Jacob A. Riis Collection, courtesy of the Museum of the City of New York. (39) Courtesy of the New York Public Library. (40) and (41) United Press International. (42) Wide World Photos, Inc. (43) From The Herblock Book, Beacon Press, 1952, courtesy of Herbert Block. (44) Ernst Haas, Magnum Photos. (45) From The Decisive Moment by Henri Cartier-Bresson, Magnum Photos, published by Simon & Schuster, Inc. (46) United Press International. Prints for (5), (18) and (23) from John Houseman’s film Voyage to America, courtesy of United States Commission, New York World’s Fair.