What states are in the southwest region?

Alternatively, Arizona, western New Mexico, western Texas, southern Colorado, and southern Utah comprise the core of the Southwestern United States under narrower definitions. Because different governmental departments of the United States have designated different states to be part of the Southwestern region, no official, uniform definition exists. read more

Southwest: Southwest,, region, southwestern United States, historically denoting several geographic areas in turn and changing over the years as the nation expanded. After the War of 1812, the Southwest generally meant Missouri, Arkansas, and Louisiana; after Texas was annexed, it, too, was included. read more

The Southwestern United States (Spanish: Suroeste de Estados Unidos; also known as the American Southwest) is the informal name for a region of the western United States. Definitions of the region's boundaries vary a great deal and have never been standardized, though many boundaries have been proposed. read more