Wikipedia:WikiProject United States regions/Non-Official Region Template and Infobox

The Southwest
Location in the U.S.
States Always Included: (Red)	Arizona, New Mexico
States Sometimes Included: (Orange)	California, Colorado, Nevada, Oklahoma, Texas, Utah
States Rarely Included: (Yellow)	Arkansas, Louisiana, Kansas

Lead Paragraph

1. Origin
2. Interpretations
3. Definition Evolution
4. Most Common Use