Courtesy of Wikipedia:
"Though regional definitions vary from source to source, New Mexico and Arizona (in dark red) are almost always considered the core, modern-day Southwest. The lighter red and striped states may or may not be considered part of this region. The lighter red states are also classified as part of the West by the U.S. Census Bureau, though the striped states are not (Texas and Oklahoma)."
2016 XD 5.0 Cummins Pro4x Pearl White, Build date 4/2016, Conven & Util + Audio, Bumper Step Assist, Dark Chrome Step Rails (needed someplace to clean my boots before entering!), Front & Rear Splash Guards. 2004 Subaru Forester, 99.5 Powerstroke with mods, previously a 2011 Xterra Pro-4X - (a fine vehicle but was upsized by the XD)