Idk about early humans, but most people need a really good reason to move to a hostile environment. Push factors include discrimination of religion, race, tradition, economic, or simply put, the homeland cannot provide for them. These people could also be outlaws of their land. Pull factors might include opportunities and resources. The Wild West was dangerous back then yet offered oil or the California gold rush. Many settlements in Alaska are where they are because of oil, and to this day, oil brings in a lot of money.
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