>>212059360
It's not a stereotype, it's a really fucking old lie told by families who needed to explain away dark skin or nappy hair having a resurgence down the family tree. Claiming to have "Indian princess" blood was far more prestigious than admitting you had negro blood in the family, because if you admitted that you might end up with your darker-skinned kids getting segregated or shunned from higher society.
The princess angle was exotic instead of illegal and it also helped if you were moving in WASP circles that prized being able to trace their lineage back to the mayflowe, because then it also meant you weren't fresh off the boat and drew people's mind to the early settlers and Pocahontas etc.
These days there's people who do DNA tests to find out which tribe their Indian Princess ancestor was from, only to find out she was from Africa.