Dixieland vs Southern United States

Dixieland

name
  • The southern states of the US; Dixie. 

  • The southwestern corner of Utah; Dixie. 

noun
  • A type of jazz that originated in New Orleans. 

Southern United States

name
  • An expansive region encompassing the southeastern and south-central part of the United States, typically defined as including the states of Texas, Oklahoma, Louisiana, Arkansas, Alabama, Mississippi, Tennessee, Kentucky, Florida, Georgia, North Carolina, South Carolina, West Virginia, and Virginia, sometimes also Maryland, Delaware, Washington, D.C., and Missouri. 

How often have the words Dixieland and Southern United States occurred in a corpus of books? (source: Google Ngram Viewer )