1. South Carolina
2. Mississippi
3. Florida
4. Alabama
5. Georgia
6. Louisiana
7. Texas
8. Virginia - which is why they are targeting UVa so highly, though they are not a cultural fit, even as UVa is a state flagship university
9. Arkansas
10. Tennessee
11. North Carolina - which is why they are targeting UNC, though UNC is an excellent candidate for the SEC
12. Missouri - has a star on the flag, but it was a slave-state that did not secede as expected
13. Kentucky - has a star on the flag, but it was a slave-state that did not secede as expected
Maryland and Delaware are the other two slave-states, but they are too far north, though Maryland is south of the Mason-Dixon Line. If the SEC could get Maryland to jump from the Big 10, they would do it. Technically, West Virginia was a slave state too, but chose to break away from Virginia because Virginia seceded. The SEC seriously considered WVU at the time they took Mizzou and aTm.
People can pretend like this Confederacy stuff is a big joke and not true, but the older SEC alums take this (and their flags) very seriously.