Allotment resulted in impoverishment and marginalization, and if desperation was reason to assimilate, then it sometimes caused that, too, although to a much smaller extent than its champions had predicted.
It is the isolation from traditional social networks and economic systems such as Buffalo that accomplishes this. I just thought of how I will go to food-service work in an hour and administer 'Buffalo Sauce' and the thought and association made me sick. That people's livelihoods were destroyed so they would be replaced by making practically extinct a magnificent species. And now I use that word every work-day in the context of a pungent smelling, spicy, cowboy/country-western themed hot-sauce condiment.