As I see it…
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the South is Louisiana, Mississippi, Alabama, Georgia, South Carolina and the panhandle of Florida.
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Texas is its own country - neither Southern or Western, just…Texas. Oklahoma and Arkansas are tributaries of Texas.
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North Carolina, Virginia, Tennessee, West Virginia and Kentucky are “Appalachian.”
Just my own personal interpretation, based on several years living in Virginia and South Carolina – could be contrary to the facts on the ground.