Was it based on skin color?
While more can always be said, this section of our FAQ may be of some interest to you. Indigenous people were enslaved in the Americas in large numbers.
There's always more to be said, but in the meantime you may find answers here by u/enygma9753 about the enslavement of natives in the Americas, New France and the complex relationship between the indigenous people of Canada and the colonial powers before and after the 1759 Conquest of Quebec.
While there were some black slaves in Canada since the New France era, there were more native slaves. The fur trade drove the economy in Canada, which required partnerships and alliances with the native peoples. Natives would often "gift" captured native rivals as slaves to European allies to seal a political deal or commercial agreement. As a Catholic colony, New France also had a religious duty to convert indigenous slaves to Catholicism and provide for their education.
Canada didn't have the industrial-scale plantation economy that required the mass importation of African slaves. Such slaves were acquired indirectly from America, not Africa. More black slaves arrived in Canada in the aftermath of the American Revolution with the Loyalist migration.