Approximate route of the Butterfield Overland Stage though Texas
Special credit to Steven Craig.
The Butterfield Overland Mail Trail ran from about 1858 to 1861 on a route that began in either Memphis or St. Louis and terminated in San Francisco carrying passengers and U. S. Mail. It began with the Overland Mail Expedition, which was a test of the route in January of 1858 and took about 25 days. Ultimately, the same general route was authorized by then Postmaster General Aaron Brown to deliver the U. S. Mail. Prior to this, mail was shipped from the Gulf of Mexico to Panama, freighted across Panama and shipped on to San Francisco and other west coast destinations or shipped around South America.