The Southwest Region was established on August 1 , 1937 , as Region Three covering the Southwest States .
Southwest Region The Southwest Region consisted of 41 parks in six states : Louisiana , Arkansas , Oklahoma , Texas , New Mexico , and the northeast corner of Arizona .
The Southwest Region was established on August 1 , 1937 , as Region Three covering the Southwest Region   .
Southwest Region The Southwest Region consisted of 41 parks in six states : Louisiana , Arkansas , Oklahoma , Texas , New Mexico , and the northeast corner of Arizona .