Why is Arizona New Mexico Texas and Oklahoma called the Southwest Region?

The states of Arizona, New Mexico, Texas, and Oklahoma are not collectively referred to as the "Southwest Region". While they are all located in the southern and western parts of the United States, they are more commonly associated with the following regions:

- Arizona and New Mexico: These states are often considered part of the "Southwest" or "Mountain West" regions.

- Texas: Texas is typically associated with the "South" or "South Central" regions.

- Oklahoma: Oklahoma is usually grouped with the "South Central" or "Midwest" regions.

The terms "Southwest Region" or "Southwestern United States" typically refer to the states of Arizona, New Mexico, Utah, Colorado, and Nevada.