Hi, this is more of an anthropology question (/r/AskAnthropology), but it comes up in this sub from time to time. While you're waiting for direct answers here, check out these earlier answers

• Why did nomadic people of the Arctic never head south? featuring /u/reedstilt

• Why didn't Inuit/First Nations (Eskimo) peoples move south? featuring /u/GlendaleTrain

• Why did a lot of humans settle in cold climates, when humans are more comfortable in warmer climates? featuring /u/Boatus and others

• and a bit of a rambling discussion in Did Eskimo / Inuit / northern peoples know there was a warmer climate to the south?

All of these posts have been archived by now, so if you have followup questions for any of the users, just ask them here & tag their username to notify them