Tribal land belongs to the tribe and it is their decision to make, not Uncle Sam’s.
I can’t speak for tribes other than those in Calif, but in many cases out here, tribes are selective on their membership. Tribes vote people off the island so control of the wealth of a casino or farming operation wealth is narrowed to a very few families. The land is communal, tribal membership is arbitrary, so there is no incentive to build a nice house and no way to create generational wealth. One tribe has no obligation to share with another tribe. The tribe members that are voted out in favor of a select group of ‘the chosen’ having no place to go, and so they form micro-tribes of 20-60 individuals (perhaps including relatives from Mesico), and demand recognition, funding and even more land for their micro-tribe. California started with a few dozen recognized tribes which have increased to 110 over as many years. And then there are about 70 or 80 micro-tribes (and growing) all demanding recognition. Leaving Californians to ask, where does it end?