I Grew up near a rez in ND, my dad worked at the tribal college for as long as I can remember. Open enrollment does help. A sizable chunk of the local public school population lived on the rez. The tribal highschool looks more like a prison (not a single window on the outside) and teachers rarely last more than a couple years.

On the note of the sad state of diversity initiatives, I recall a particular quote from a local restaurant owner: "If their last name has a verb or an animal in it I throw it in the trash"