The entire situation is a disgusting.
North Dakota has open enrollment, so there are a lot of buses from other schools on the rez each morning (which I find good for the students). The tribes runs the local school not the BIE, and I think that is much more common these days. We don't have any of the old BIA schools, and the most common boarding school in our area is a world of difference from the old government crap (it is now run by Native Americans and does wonders for troubled children).
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"
Oh yeah, that place was a horrible place since it was half public (high school), half BIA (elementary). I am told they have improved, but it was not great when I went there. They finally got rid of the BIA.
Yeah, some of the "border" towns have some really, flat out racist people. The "safety inspections" on the first of the month positioned to stop all cars coming off the rez were some serious BS. Talk about hitting people when they are already down.
As for the boarding schools, SD still has the definite residential schools. My hometown has one, and it's depressing. Over the past decade they've; drawn national criticism for for fraudulent fund raising, forbid a Lakota ceremony from being performed at HS graduation while allowing a Christian prayer, moved away a priest after decades of hushed up rape accusations, and passed a state law making them unable to be sued by any past victims of abuse.