Butterfield Overland Mail in Arkansas and Missouri
The Butterfield Overland Mail in Arkansas and Missouri was created by the United States Congress on March 3, 1857, and operated until March 30, 1861. The route that was operated extended from San Francisco, California to Los Angeles, then across the Colorado Desert to Fort Yuma, then across New Mexico Territory via, Tucson and Mesilla, New Mexico to Franklin, Texas, midpoint on the route.
Source: Wikipedia — Butterfield Overland Mail in Arkansas and Missouri (CC BY-SA 4.0)