Systemic racism and a heritage of FN genocide. There's definitely progress on treating First Nations as an equal part of Canada, but not even close to making up for and elimination of the 200++ years of subjugation and genocide and the lasting social effects of that long term crime.
As much as Canada is seen by itself and a lot of the world as a very good, fair country....our past is full of dirty little secrets, and our soldiers have a penchant for dabbling in war crimes.
I'm Canadian. Some parts of my family have been in north America since the 1800s, and other parts were here before Europeans decided it was theirs. I love Canada...but loving it means that I feel a duty to bring up the dirty little secrets, and hold ourselves accountable for the shit we've done. There's no way forward as an upstanding example of what a good and fair country is without exposing all of it and actually trying to make it right.
The way things are going, I'm not sure that will happen in my lifetime. If ever.