Respuesta :
They migrated into Alaska and northern Canada, south along the Pacific Coast, into the interior of Canada, and south to the Great Plains and the American Southwest. Na-Dené-speaking peoples were the earliest ancestors of the Athabascan-speaking peoples, including the present-day and historical Navajo and Apache.
Seeking to escape the hardships of the colder climates, early migrants moved south into North America seeking warmer areas to live.
(Pretty much; They wanted to find a warmer climate.)