1859, first attested in the song of that name, which was popularized, if not written, by Ohio-born U.S. minstrel musician and songwriter Dan Emmett (1815-1904); perhaps a reference to the Mason-Dixon Line, but there are other well-publicized theories dating back to the Civil War. Popularized nationwide in minstrel shows. Dixieland style of jazz developed in New Orleans c. 1910, so called from 1919.
