If not the largest Indian tribe in the USA, the Navajo are the second largest. The reservation is in the Four Corners area in Southwest USA, and the tribe has a lot of political clout. For some reason, now unknown to history, a group of Athabascan speaking Indians left northwest Canada between 900 A.D. and 1200 A.D. and moved to the southwestern United States, primarily Arizona and New Mexico. This group became the Apaches. Contact with the Spaniards caused social change in the Apache groups, and a large group split off and took up sheep raising. The sheep were gained from the Spaniards. This group became the Navajo. The closest relatives to the Navajo are the Apache and then most of the Athbascan speaking Indians in all of northwestern Canada and most of Alaska.

You wont go too far without seeing a few here in Arizona. They have a special place with us Jarheads for the Code Talkers of WW2.