Jack, A Bright Indianapolis Boy of 13: Was a Messenger at the age of 11. Indiana has no age limit for mes'grs. Aug., 1908. Wit., E. N. Clopper. Location: Indianapolis, Indiana.
You can find a high-resolution version of this image by Lewis Wickes Hine at the Library of Congress website.
Arizona (circa 1885)
Florida (circa 1910)
Georgia (circa 1940)