The New York Public Library has an excellent collection of images by Lewis Wickes Hine (Documentary Photographs, 1905-1938). The photoset focuses mainly on labor and immigrant life in New York (and throughout the East Coast). The images seem to earnestly embody all of the early 1900s cliches (newspaper boys, tenement baseball, iron workers on buildings) you could shake a stick at. That said, I think the photos are amazing and show the growth and development of a country and a group of people. Some of my favorite images below and the full set can be seen here.