Either get freedmen to be persecuted by Northerners, Canadians, and look even further north for a land of equality...
...or have a band of Africans, Australian Aborigines, or Papua New Guineans settle the far north or far south and take up a lifestyle that allows them to survive without getting health complications from lack of sunlight.
In the former scenario, whether they adopt Inuit language and religion doesn't matter, but they must take up the lifestyle.
In the latter scenario, they don't have to be literally culturally Inuit.
...or have a band of Africans, Australian Aborigines, or Papua New Guineans settle the far north or far south and take up a lifestyle that allows them to survive without getting health complications from lack of sunlight.
In the former scenario, whether they adopt Inuit language and religion doesn't matter, but they must take up the lifestyle.
In the latter scenario, they don't have to be literally culturally Inuit.