Arizona is in three regions of the United States.
Arizona ( [ ɛərᵻˈzoʊnə , _ ærᵻ - ] ) ( Hoozdo Hahoodzo [ xòːztò xɑ̀xòːtsò ] O'odham : Alĭ ṣonak [ ˡaɺi ˡʃonak ] ) is a state in the southwestern region of the United States . It is also part of the Western and the Mountain states . Arizona , a state in the southwestern region of the United States of America , is known for its high population of Native Americans .