Question: Which US state is considered part of the Western States, the Mountain States, southern Great Plains States, and Southwestern States?
Sentence (from "Arizona"): Arizona ( ; Navajo: "Hoozdo Hahoodzo" [xòːztò xɑ̀xòːtsò] ; O'odham: "Alĭ ṣonak" [ˡaɺi ˡʂonak]) is a state in the southwestern region of the United States.
Relevant evidence: Yes