Genocide of our indigenous population mostly. The worst of it ended in 1996 when the last residential school closed. Basically, the Catholic Church under the authorization of the Canadian Federal Government in the 1800s and onwards, abducted children from indigenous communities, took them to boarding schools where they attempted to assimilate them into Eurocentric culture by punishing them for speaking their own language and practicing their own culture. Beatings, sexual abuse, and neglect were commonplace, with many children dying of illness, exposure, or violence. Many children survived the schools and are still alive today to tell us about it. There are also mass graves at several of these schools where children's corpses were dumped and hidden from public view, until ground x-ray technology came around and we found the graves.

Also, random weird fact: women weren't allowed to have bank accounts in Canada until like 1964.