Oklahoma is the Northwestern corner of the the South and North Eastern Corner of the Southwest, we field three to one Confederates as we did Unionist so I feel we qualify as a Southern State or Territory,,Oklahomans have always considered ourselves Southern or Southwestern. I guess if you got technical you could call us Mid-South. But a look at the map will show you we are in the Southern portion of the Country, Oklahoma is further South than Virginia, Kentucky and Misouri, heck even our part of the Great Plains are called the Southern Plains,,,