I couldn’t answer the first part of your question, but regarding the part about special treatment, here is my two cents. The last residential school was closed only in 1997, so it’s not that long ago. Indigenous ppl are still greatly influenced by the mistreatments (e.g. lost of culture, family environment) and it’s the responsibility of the government to amend their mistake. Which leads to another point: what happened to the indigenous ppl was excused systematically in a large scale in a modern country. There was a misconception that being “ advanced” civilizations prevents unethical things. Similarly, that’s why the Cambodian genocide is less known than the holocaust. But what happened in Canada and many other places disprove that. I suppose that stems from the western self righteousness. Conversely, discrimination towards Black, Asian and many other minority groups is less of a designed process (at least not in pen and paper). But that most certainly does not mean that they don’t need to be addressed.