mesteño

The English word mustang (a feral or semi-feral horse of the American West) derives from Spanish mesteño (stray, belonging to no one, ownerless), an adjective formed from the medieval Spanish noun mesta. The Mesta was the powerful association of sheep ranchers in medieval and early modern Castile — the Honrado Concejo de la Mesta, the Honorable Council of the Mesta, established in 1273 by Alfonso X — which held extensive legal rights to seasonal migration corridors across the Iberian Peninsula. The word mesta itself derives from Late Latin mixta (mixed herd), the feminine past participle of miscere (to mix), from the Proto-Indo-European root *meik- (to mix), which gives English 'mix,' 'miscellaneous,' 'meddle,' and 'promiscuous.' A mesteño animal was literally a 'mixed' or 'unaccounted-for' animal — one that had wandered from its owner's herd and joined the mixed common herd managed by the Mesta, or simply an animal with no clear owner. The mesteño was property without a proprietor, a stray that had rejoined the common stock. American English absorbed the word in the nineteenth century, anglicizing mesteño phonetically to 'mustang' and applying it specifically to the feral horses of the American plains.

The horse that became the mustang arrived in the Americas with Spanish colonization. Horses had been extinct in the Americas for approximately ten thousand years when Hernán Cortés landed in Mexico in 1519 with sixteen horses — the first horses to set foot in the New World since the end of the Pleistocene. The reintroduction of the horse transformed the Americas far more profoundly and rapidly than any other aspect of European contact. Within a century of Spanish arrival, horses had spread north from Mexico into the plains through trade, raid, and escape, and the Plains Indian cultures that encountered the horse for the first time underwent a total cultural revolution: the horse enabled the bison-hunting nomadic lifestyle that became the iconic Plains culture and that European and American observers later mistook for the timeless traditional culture of all Native Americans. The mustang — the feral horse descended from escaped or traded Spanish colonial stock — was the vector of this transformation.

The Spanish colonial ranching system in New Spain lost horses to the wild through multiple mechanisms: horses escaped from corrals, were traded or raided by indigenous communities, and were deliberately released or abandoned when ranches were abandoned. Horses are highly social and adaptable animals, and feral horses quickly form stable bands and expand their range. By the early eighteenth century, feral horse herds — mesteños, mustangs — ranged across the Great Plains and the intermountain West in numbers that may have exceeded two million animals at the peak in the mid-nineteenth century. The Comanche people in particular became extraordinarily skilled horsemen who built a military power on the horse — acquiring Spanish horses through trade and raid, breeding them selectively, and using them to dominate a territory that stretched from Texas to Colorado for over a century. The mustang was simultaneously a Spanish colonial legacy, an indigenous cultural revolution, and an ecological transformation of the North American grasslands.

American settlement and the westward expansion of cattle ranching in the nineteenth century brought Anglo cowboys into contact with feral mustang herds, and the Spanish term mesteño — heard from Mexican vaqueros — became the standard English word for these animals. The mustang of American frontier culture was simultaneously a practical resource (wild horses that could be captured and broken for work), a romantic symbol of freedom (the wild horse of the plains as an emblem of untamed nature), and an economic competitor (feral horses competing with cattle for grass and water). The tension between the mustang as symbol of Western freedom and the mustang as management problem for ranchers and rangeland managers has never been fully resolved: the Wild Free-Roaming Horses and Burros Act of 1971 gave mustangs federal protection, and the ongoing debate about how to manage feral horse populations on public lands in the American West continues to pit agricultural interests against wildlife advocates and cultural preservationists.