Transportation
New Mexico has long been an important corridor for trade and migration. The builders of the ruins at Chaco Canyon also created a radiating network of roads from the mysterious settlement. Chaco Canyon's trade function shifted to Casas Grandes in the present-day Mexican state of Chihuahua, however, north-south trade continued. The pre-Columbian trade with Mesoamerican cultures included northbound exotic birds, seashells and copper. Turquoise, pottery, and salt were some of the goods transported south along the Rio Grande. Present-day New Mexico's pre-Columbian trade is especially remarkable for being undertaken on foot. The north-south trade route later became a path for colonists with horses arriving from New Spain as well as trade and communication. The route was called El Camino Real de Tierra Adentro.
The Santa Fe Trail was the 19th century US territory's vital commercial and military highway link to the Eastern United States. All with termini in Northern New Mexico, the Camino Real, the Santa Fe Trail and the Old Spanish Trail are all recognized as National Historic Trails. New Mexico's latitude and low passes made it an attractive east-west transportation corridor. As a territory, the Gadsden Purchase increased New Mexico's land area for the purpose of the construction of a southern transcontinental railroad, that of the Southern Pacific Railroad. Another transcontinental railroad was completed by the Atchison, Topeka and Santa Fe Railway. The railroads essentially replaced the earlier trails but brought on a population boom. Early transcontinental auto trails later crossed the state bringing more migrants. Railroads were later supplemented or replaced by a system of highways and airports. Today, New Mexico's Interstate Highways approximate the earlier land routes of the Camino Real, the Santa Fe Trail and the transcontinental railroads.
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