Dixie is a historical nickname for the Southern United States.
As a definite geographic location within the United States, "Dixie" is usually defined as the eleven Southern states that seceded in late 1860 and early 1861 to form the new confederation named the Confederate States of America. They are (in order of secession): South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, North Carolina, and Tennessee. Missouri and Kentucky were the 12th and 13th to secede, but were technically both union and confederate.
However, the location and boundaries of "Dixie" have become, over time, more limited, vernacular, and mercurial. Today, it is most often associated with those parts of the Southern United States where traditions and legacies of the Confederate era and the antebellum South live most strongly. The concept of "Dixie" as the location of a certain set of cultural assumptions, mind-sets and traditions (along with those of other regions in North America) was explored in the 1981 book The Nine Nations of North America.
Many businesses in the South contain "Dixie" in their name as an identifier, such as supermarket chain Winn-Dixie.