When you think about it, you can’t really say it was impossible for anyone to see it coming. The sins of the ancestors are observably being meted out to their descendants, and with an ironic vengeance when one considers the source of the core concept that is fueling all of the latest migration and demographic changes across the American continent.
As I can personally attest, it takes as little as two generations to go from being a member of a recognized tribe to strangers denying that you could possibly have any relationship to it. In the ages of chaos, the world changes much faster, and much more comprehensively, than most people have the capacity to imagine.