The whole situation reminds me Sacheen Littlefeather, the woman Marlon Brando had representing him during the 1973 Oscars to protest the treatment of native Americans. According to her family, she also fabricated her native ancestry (her family was European/Mexican).
There's no doubt that life in the 60/70s was rough for your typical indigenous person (not that things are perfect now), but the timeframe does coincide with increased public attention of native issues, and thus the inevitable pretendians. Some people just love attention, even if means taking it from actual victims. Add in the self-absorbed personalities of many actors or performers, and it's even less of a surprise that they continue it once it gains traction and feeds their ego.
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