The term "Deep South" is defined in a variety of ways:
Though often used in history books to refer to the seven states that originally formed the Confederacy, the term "Deep South" did not come into general usage until long after the Civil War ended. Up until that time, "Lower South" was the primary designation for those states. When "Deep South" first began to gain mainstream currency in print in the middle of the 20th century, it applied to the states and areas of Georgia, southern Alabama, Florida, Mississippi, north Louisiana, and East Texas, all historic areas of cotton plantations and slavery. This was the part of the South many considered the "most Southern".
Later, the general definition expanded to include all of South Carolina, Georgia, Alabama, Mississippi, and Louisiana, and often taking in bordering areas of East Texas and North Florida. In its broadest application today, the Deep South is considered to be "an area roughly coextensive with the old cotton belt from eastern North Carolina through South Carolina west into East Texas, with extensions north and south along the Mississippi". Houston is the largest city of the Deep South region.
Metropolitan areas with more than 1,000,000 people:
In the 1980 census, of those people who identified solely by one European national ancestry, most European Americans identified as being of English ancestry in every Southern state except Louisiana, where more people identified as having French ancestry. A significant number also have Irish and Scots-Irish ancestry.