From Custer Died for Your Sins by Vine Deloria Jr.:

The early colonists, accustomed to life under benevolent despots, projected their understanding of the European political structure onto the Indian tribe in trying to explain its political and social structure. European royal houses were closed to ex-convicts and indentured servants, so the colonists made all Indian maidensprincesses, then proceeded to climb a social ladder of their own creation. Within the next generation, if the trend continues, a large portion of the American population will eventually be related to Powhattan.

While a real Indian grandmother is probably the nicest thing that could happen to a child, why is a remote Indian princess grandmother so necessary for many whites? Is it because they are afraid of being classed as foreigners? Do they need some blood tie with the frontier and its dangers in order to experience what it means to be an American? Or is it an attempt to avoid facing the guilt they bear for the treatment of the Indian?