” They had horrible wars between tribes including some of extermination.”
Yes.
The only reason the Apache were in the badlands of Arizona, New Mexico and Northern Mexico, was because the Comanche chased them out of Texas and the better parts of New Mexico.
And the Apaches fought with other groups, or bands of Apaches. Which is how the US Army finally subdued them, by befriending various Apache groups with grievances against other groups.