San Luis Potosí

San Luis Potosí, officially the Free and Sovereign State of San Luis Potosí, is one of Mexico’s 32 federal entities. It sits in the eastern and central parts of the country, sharing borders with seven other states: Nuevo León to the north, Tamaulipas to the northeast, Veracruz to the east, and Hidalgo, Querétaro, and Guanajuato to the south, with Zacatecas to the northwest. The state is split into 59 municipalities and takes its name from its capital, San Luis Potosí. Other important cities include Ciudad Valles, Matehuala, Rioverde, and Tamazunchale.

Before the Spanish arrived, the area now called San Luis Potosí straddled two cultural regions: Mesoamerica and Aridoamerica. The northern and west-central parts were home to nomadic Otomi and Chichimeca hunter-gatherers. Though many indigenous people died during colonization, Huasteco, Pame, and Náhua communities remain today.

The state’s founding was sparked in 1592 by the discovery of gold and silver deposits. Spanish miners set up the first settlement, “San Luis de Mezquitique,” on the site of what is now the capital. Juan de Oñate became its first mayor. The name “San Luis” honors King Louis IX of France, while “Potosí” was borrowed from the famously wealthy silver mines in Potosí, Bolivia—settlers hoped to match that fortune, but never truly did. During the 1600s and 1700s, Franciscan, Augustinian, and Jesuit missionaries arrived, building churches and other structures that still stand, many now serving as museums or universities.

In mid-1821, after Mexico’s independence, General José Antonio Echavarri pressured the mayor and city council of San Luis to surrender to Agustín de Iturbide’s Army of the Three Guarantees. With no means to resist, they complied, and the state’s independence was proclaimed. The first state constitution was written on October 16, 1826, and remained in force until 1835, when a centralist Congress abolished local legislatures and had governors appointed by the central government. This lasted until the 1857 Constitution.

During the Mexican-American War (1846–1847), the state contributed key leaders and ideas, earning it the nickname “San Luis de la Patria” (Saint Louis of the Homeland). It played a prominent role in the Reform War, and during the French Intervention in 1863, President Benito Juárez made San Luis Potosí the national capital. Under Emperor Maximilian, the city was held by imperial forces until late 1866. That same year, a telegraph line opened between San Luis Potosí and Mexico City, improving communications and spurring industrialization.

Geographically, most of the state sits on the Mexican Plateau, except for the eastern part, where the plateau drops into the tropical valley of the Tampaon River. That river flows northwest and becomes the Pánuco River, forming part of the border with Tamaulipas. The plateau’s surface is fairly flat, with low, wooded mountain ridges. The Sierra Madre Oriental runs north-south through the state, separating the plateau from the Gulf Coastal Plain to the east. This mountain range hosts Sierra Madre Oriental pine-oak forests. The easternmost area lies on the coastal plain, covered by Veracruz moist forests. The state’s eastern quarter, known as the Huasteca potosina, is part of the larger La Huasteca region, a cultural and geographical area tied to the Huastec people.

The Tampaon River and its tributaries drain the southern and southeastern parts of the state. The north and central areas, including the capital, sit in an interior basin with no drainage to the sea. The average elevation is about 1,800 meters (6,000 feet), giving the state a mostly temperate climate. The northern part falls within an arid zone, while the southern half gets more rain from the Nortes winds. Rainfall is unreliable in the west and north, and much of the state lacks major rivers. Still, the soil is fertile, and in good seasons, upland farms produce wheat, maize, beans, and cotton. In the low tropical valleys, sugar, coffee, tobacco, peppers, and fruit are staples. Livestock is important, with hides, tallow, and wool exported. Fine woods for cabinetmaking and construction are also produced and exported on a small scale.

At one point, San Luis Potosí was among Mexico’s top mining provinces, but the revolts after independence caused a steep decline. The area around Real de Catorce holds some of the country’s richest silver mines. Other notable silver districts include Peñón Blanco, Ramos, and Guadalcázar. Guadalcázar’s development dates to 1620, and its ores yield gold, copper, zinc, and bismuth.