Dixie (n.) Look up Dixie at Dictionary.com
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.
It is interesting to remember that the song which is essentially Southern -- "Dixie" -- and that which is essentially Northern -- "Yankee Doodle" -- never really had any serious words to them. ["The Bookman," June 1910]