Eli5: Why did civilizations such as the Pre Dorset, Thule, and Inuit not migrate south if their environments were so harsh and extreme?

Question

I read a few articles where some of these civilizations main focus was keeping warm because they were located so far north. So why would they not migrate more south?

In: 661

Answer 1

I see many interesting answers.
I think maybe they were forced by other civilizations to keep there, like actual migrants that are not welcomed.
Other fact might be that they were scared to leave their area due to ignorance, rival tribes and superstition, like the monsters in the border of the ocean that keep Europeans in their continent until about 1500.