Indigenous peoples of Mexico

The pre-Columbian (or pre-Hispanic) history of the territory now making up the country of Mexico is known through the work of archaeologists and epigraphers, and through the accounts of Spanish conquistadores, settlers, and clergymen, as well as those of the indigenous chroniclers of the immediate post-conquest period.

Human presence in the Mexican region was once thought to date back 40,000 years, based upon what were believed to be ancient human footprints discovered in the Valley of Mexico; but, after further investigation using radioactive dating, it appears that this was an overestimate. It is currently unclear whether 21,000-year-old campfire remains found in the Valley of Mexico are the earliest human remains in Mexico. Indigenous peoples of Mexico began to selectively breed maize plants around 8000 BC. Evidence shows a marked increase in pottery working by 2300 BC and the beginning of intensive corn farming between 1800 and 1500 BC.

The Aztecs (/ˈæztɛks/ AZ-teks) were a Mesoamerican civilization that flourished in central Mexico from 1300 to 1521. The Aztec people included different ethnic groups of central Mexico, particularly those groups who spoke the Nahuatl language. Aztec culture was organized into city-states (altepetl), some of which joined to form alliances, political confederations, or empires. The Aztec Empire was a confederation of three city-states established in 1427: Tenochtitlan (the capital city of the Mexica or Tenochca), Tetzcoco, and Tlacopan, previously part of the Tepanec empire, whose dominant power was Azcapotzalco. Although the term Aztecs is often narrowly restricted to the Mexica of Tenochtitlan, it is also broadly used to refer to Nahua polities or peoples of central Mexico in the prehispanic era, as well as the Spanish colonial era (1521–1821).

Most ethnic groups of central Mexico in the post-classic period shared essential cultural traits of Mesoamerica. The culture of central Mexico includes maize cultivation, the social division between nobility (pipiltin) and commoners (macehualtin), a pantheon, and the calendric system. Particular to the Mexica of Tenochtitlan was the patron god Huitzilopochtli, twin pyramids, and the ceramic styles known as Aztec I to IV. The Mexica were late-comers to the Valley of Mexico, and founded the city-state of Tenochtitlan on unpromising islets in Lake Texcoco, later becoming the dominant power of the Aztec Triple Alliance or Aztec Empire which conquered other city-states throughout Mesoamerica. It originated in 1427 as an alliance between the city-states Tenochtitlan, Texcoco, and Tlacopan to defeat the Tepanec state of Azcapotzalco, which had previously dominated the Basin of Mexico. Soon Texcoco and Tlacopan were relegated to junior partnership in the alliance, with Tenochtitlan the dominant power. The empire extended its reach by a combination of trade and military conquest. It was never a true territorial empire controlling territory by large military garrisons in conquered provinces but rather dominated its client city-states primarily by installing friendly rulers in conquered territories, constructing marriage alliances between the ruling dynasties, and extending an imperial ideology to its client city-states. Client city-states paid taxes, not tribute to the Aztec emperor, the Huey Tlatoani, in an economic strategy limiting communication and trade between outlying polities, making them dependent on the imperial center for the acquisition of luxury goods. The political clout of the empire reached far south into Mesoamerica conquering polities as far south as Chiapas and Guatemala and spanning Mesoamerica from the Pacific to the Atlantic oceans.

The Political Constitution of the Mexican Republic of 1857 (Spanish: Constitución Política de la República Mexicana de 1857), often called simply the Constitution of 1857, was the liberal constitution promulgated in 1857 by Constituent Congress of Mexico during the presidency of Ignacio Comonfort. Ratified on February 5, 1857, the constitution established individual rights, including universal male suffrage, and others such as freedom of speech, freedom of conscience, freedom of the press, freedom of assembly, and the right to bear arms. It also reaffirmed the abolition of slavery, debtors' prisons, and all forms of cruel and unusual punishment such as the death penalty. The constitution was designed to guarantee a limited central government by federalism and created a strong national congress, an independent judiciary, and a small executive to prevent a dictatorship. Liberal ideals meant the constitution emphasized private property of individuals and sought to abolish common ownership by corporate entities, mainly the Catholic Church and indigenous communities, incorporating the legal thrust of the Lerdo Law into the constitution.

A number of articles were contrary to the traditional powers of the Catholic Church, such as the ending of Catholicism as official religion, the nationwide establishment of secular public education, the removal of institutional fueros (legal privileges), and the forced sale of Church property. Conservatives strongly opposed the enactment of the constitution, which polarized Mexican society. The Reform War (1858-1860) began as a result, with liberals winning on the battlefield over conservatives. The losing conservatives sought another way back into power, and their politicians invited Maximilian I of Mexico, a Habsburg, to establish a Mexican monarchy with the Church's support. The republican government-in-domestic-exile was headed by President Benito Juárez as the legitimate Mexican government under the constitution. With the ouster of the French and the defeat of the conservatives in 1867, the Restored Republic was again governed under the 1857 Constitution. The constitution was durable but its provisions not always followed in practice. It was revised in 1874 to create a Senate. It remained as Mexico's constitution until 1917 although many of its provisions ceased to be enforced.

In the history of Mexico, La Reforma (from Spanish: "The Reform"), or reform laws, refers to a pivotal set of laws, including a new constitution, that were enacted in the Second Federal Republic of Mexico during the 1850s after the Plan of Ayutla overthrew the dictatorship of Santa Anna. They were intended as modernizing measures: social, political, and economic, aimed at undermining the traditional power of the Catholic Church and the army. The reforms sought separation of church and state, equality before the law, and economic development. These anticlerical laws were enacted in the Second Mexican Republic between 1855 and 1863, during the governments of Juan Álvarez, Ignacio Comonfort and Benito Juárez. The laws also limited the ability of Catholic Church and Indigenous communities from collectively holding land. The liberal government sought the revenues from the disentailment of church property, which could fund the civil war against Mexican conservatives and to broaden the base of property ownership in Mexico and encouraging private enterprise. Several of them were raised to constitutional status by the constituent Congress that drafted the liberal Constitution of 1857. Although the laws had a major impact on the Catholic Church in Mexico, liberal proponents were not opposed to the church as a spiritual institution, but rather sought a secular state and a society not dominated by religion.

The Juárez Law reduced the power that military and ecclesiastical courts held. The Lerdo Law forced land held in collective ownership to be sold to individual owners. It aimed at creating a dynamic real estate market, creating a class of yeoman farmers owning their own land, and raising revenue for the state. The measure was intended to strip the Church of most of its property, as well as to break Indigenous communities' collective ownership of land.

The Aztec or Mexica calendar is the calendrical system used by the Aztecs as well as other Pre-Columbian peoples of central Mexico. It is one of the Mesoamerican calendars, sharing the basic structure of calendars from throughout the region.

The Aztec sun stone, often erroneously called the calendar stone, is on display at the National Museum of Anthropology in Mexico City.The actual Aztec calendar consists of a 365-day calendar cycle called xiuhpōhualli (year count), and a 260-day ritual cycle called tōnalpōhualli (day count). These two cycles together form a 52-year "century", sometimes called the "calendar round". The xiuhpōhualli is considered to be the agricultural calendar, since it is based on the sun, and the tōnalpōhualli is considered to be the sacred calendar.

The Amuzgos are an Indigenous people of Mexico. They primarily live in a region along the Guerrero/Oaxaca border, chiefly in and around four municipalities: Xochistlahuaca, Tlacoachistlahuaca and Ometepec in Guerrero, and San Pedro Amuzgos in Oaxaca. Their languages are similar to those of the Mixtec, and their territories overlap. They once dominated a larger area, from La Montaña down to the Costa Chica of Guerrero and Oaxaca, but Mixtec expansion, rule and later Spanish colonization has pushed them into the more inaccessible mountain regions and away from the coast. The Amuzgos maintain much of their language and dress and are known for their textiles, handwoven on backstrap looms with very intricate two-dimensional designs. The Amuzgo area is very poor with an economy mostly dependent on subsistence agriculture and Mario guado handcraft production.

The Cuitlatec (alternatively Cuitlateco, Cuitlateca) were an Indigenous people of Mexico. They lived in the Río Balsas and Costa Grande regions of Guerrero state in Mexico's Pacific coast region. Their native Cuitlatec language is generally considered to be a language isolate. Cuitlatec is considered extinct as a linguistic group and ethnic identity, the last speaker of the language having died in the 1960s.

The name Cuitlatec is a derogatory Nahuatl exonym, the root cuitlatl carrying the vulgar meaning of "excrement". However, this also been interepreted as "gold people", given that gold was named in Nahuatl teocuitlatl, or "divine excrement". The Cuitlatec name for themselves was aʔnelgái.

The second French intervention in Mexico (Spanish: segunda intervención francesa en México), also known as the Second Franco-Mexican War (1861–1867), was a military invasion of the Republic of Mexico by the French Empire of Napoleon III, purportedly to force the collection of Mexican debts in conjunction with Great Britain and Spain. Mexican conservatives supported the invasion, since they had been defeated by the liberal government of Benito Juárez in a three-year civil war. Defeated on the battlefield, conservatives sought the aid of France to effect regime change and establish a monarchy in Mexico, a plan that meshed with Napoleon III's plans to re-establish the presence of the French Empire in the Americas. Although the French invasion displaced Juárez's Republican government from the Mexican capital and the monarchy of Archduke Maximilian was established, the Second Mexican Empire collapsed within a few years. Material aid from the United States, whose four-year civil war ended in 1865, invigorated the Republican fight against the regime of Maximilian, and the 1866 decision of Napoleon III to withdraw military support for Maximilian's regime accelerated the monarchy's collapse.

The intervention came as a civil war, the Reform War, had just concluded, and the intervention allowed the Conservative opposition against the liberal social and economic reforms of President Juárez to take up their cause once again. The Catholic Church, conservatives, much of the upper-class and Mexican nobility, and some indigenous communities invited, welcomed and collaborated with the French empire to install Maximilian as Emperor of Mexico. However, there was still significant support for republicanism in Mexico. Mexican society was most resistant to European models of governance, including monarchies, during and after the French intervention. The emperor himself however proved to be of liberal inclination and continued some of the Juárez government's most notable measures. Some liberal generals defected to the empire, including the powerful, northern governor Santiago Vidaurri, who had fought on the side of Juárez during the Reform War.