"...the roads were indescribably bad and vehicles were crude. Covered wagons were drawn by oxen, rather than horses or mules, because these slow-moving animals could withstand greater hardship, pull heavier loads, and cost less to replace."
- Bureau of Public Roads Camino Real Official Highway Route
El Camino Real (literally, "the royal road") is the oldest and longest historical trail in the Western Hemisphere. The transportation link has, through the centuries, been called various names, including El Camino Real de Tierra Adentro (literally, "the road to the interior" because the U.S. frontier was seen as the country interior to Mexico), the King's Highway and the Royal Highway. It became a transportation lifeline that helped integrate Spanish and European culture in the Southwestern U.S.
This trail was the first European inland transportation route in the continental U.S. and is considered the forerunner of the interstate highway system because it symbolizes the importance of regional and national road networks for political, social, defense, and economic gain. The roadway, which was in part composed of Indian footpaths and buffalo trails, began at Mexico City in 1540 and was developed over the next half century.