Aspects of this topic are discussed in the following places at Britannica.
...Cook Inlet in Alaska; in two isolated areas of the Pacific coast (southwestern Oregon and northern California); and in the southwestern United States (mostly in New Mexico and Arizona). Tlingit and Haida are each single languages making up separate families; they are spoken, respectively, in southeastern Alaska and British Columbia. The major language of the Na-Dené group is Navajo,...
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