midwestern states, for example Oklahoma:
https://en.wikipedia.org/wiki/Little_Dixie_(Oklahoma)
And like MU, it had zero impact on OU's recruiting. The difference is that the Sooners took sports seriously, and hired good coaches who knew how to recruit. Meanwhile, MU all but abandoned its athletic department, foolishly defunding the football program at a time when its Big 8 competitors were ramping up their investments.
But instead, like all liberals, you want to retroactively racialize an issue that had nothing to do with race. It's revisionist history with the worst intentions.
(2) Your claim that the term was "frequently used until the 1970s" is dubious at best (unless you meant the 1870s). It was allegedly used by some of the *locals* a LONG LONG time ago, and retroactively by some academics and regional historians, but (like OU) it had no impact at all on our recruiting. Southern schools (in "Big Dixie") had far worse histories and yet were able to recruit top classes with ease.