hi! questions on the 'dawn of humanity' are well into pre-history, so this question is worth x-posting to our sister sub /r/AskAnthropology. Meanwhile, you may be interested in a few similar posts here

• this post from the FAQ Why did humans leave warm or temperate zones and migrate to colder climates? - /u/brigantus

• How did Pre-Columbian native peoples in the Americas survive in inhospitable desert climates for centuries? - /u/Mictlantecuhtli

a few threads on Inuit

• 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 - the first one is above; the rest are substandard now)

• Why didn't the Eskimo and the Dorset people migrate south? - /u/400-Rabbits

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

if you have followup questions on any locked threads, ask them here & include the user's username so they'll be auto-notified