Also prevents tribal members from leaving the reservation. You can marry before leaving for a career, but your kids would have to move back to find a partner of their own. Good luck telling your kids that they have to marry not just within the same race, but the same tribe if they want their kids to inherit their identity.

It's basically ensuring those communites shrink until they disappear. It's not historical, it's not traditional, it's a calculated way to drain the blood from the tribe & disguise it as freedom of choice.