Hi, not discouraging further contributions here (or /r/AskAnthropology), but to get you started, here are some links I collected a few months ago in response to a question about Inuit peoples

Human migration

• Why did a lot of humans settle in cold climates, when humans are more comfortable in warmer climates?

• Why did humans leave warm or temperate zones and migrate to colder climates?

• What made native people choose the inhospitable places in which they live?

Staying in the north

• For what reasons did the ancestors of the Inuit choose to settle in such climates, rather than returning South? (ignore the links to other posts - they're a repeat of above)

• Did Eskimo / Inuit / northern peoples know there was a warmer climate to the south?

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

You may want to try asking this over at r/AskAnthropology, as this is more their purview than ours here, though someone may come along and answer it here as well.