Lonelythis was still occurring in Canada pretty recently, like, the 60s and 70s. Kids were just being killed and then buried by other kids in unmarked graves. Not too long ago in large amounts. Not that terrible things have not been happening to American Indians in the same time frame but...yeah...shitty all around.
Not just the 60s and 70s, the last Canadian residential school closed in 1996. There are former residential school students out there that are the same age as me and many NSers.
However you're wrong if you think this is ancient history in the US. It wasn't until 1978 that the laws in the US changed so that parents could refuse to have their kids sent away to "Indian Boarding Schools". They weren't gone by the 60s like you're suggesting, in fact enrolment doubled in that decade and peaked in the 70s. There were 60,000 students in these schools in 1973. What with the revelations here in Canada, my understanding is the Americans are going to complete an investigation as well. I doubt we will learn that things were much better south of the border. They had something like 360 schools, and with more than twice as many schools there were likely twice as many students involved, and quite possibly twice as many students killed.
As for those asking why Canadian residential schools were so bad, these schools were specifically designed with the intention of wiping out indigenous culture. Words like "eradicate" were used non-ironically, as if nativeness was some pest that needed to be removed at any cost. Children were ripped from their families and sent to what was essentially a federally-funded and church-run prison. They had their heads shaved, clothes stripped from them, and were given new names. They were beaten if they spoke their language or attempted to leave. Physical and psychological abuse, disease, neglect and malnutrition ran rampant. It wasn't just the Catholic Church responsible - some were run by Anglican and United churches, and later directly by the government - however the Catholics are getting the most attention because of their lack of formal apology and unwillingness to release records. We're talking 140 schools, and 150,000+ children. The Truth and Reconciliation Commission estimated that between 4000 and 6000 children died in their report a couple years back, although many believe that even that is a conservative estimate and the reality is over 10,000. These unmarked graves have been somewhat of an open secret for a long time - the bodies of the missing children had to be somewhere. I've seen it mentioned that the reason the Kamloops school is still standing is because they can't dig anywhere without hitting bodies. We've located just over 1000 now, but that's a small fraction of what we will find as the search is expanded to all school sites.