Mexico contains the administrative territorial entity Mexico City
Etymology
Mēxihco is the Nahuatl term for the heartland of the Aztec Empire, namely the Valley of Mexico and surrounding territories, with its people being known as the Mexica. The terms are plainly linked; it is generally believed that the toponym for the valley was the origin of the primary ethnonym for the Aztec Triple Alliance, but it may have been the other way around. In the colonial era (1521–1821) Mexico was called New Spain. In the eighteenth century, this central region became the Intendency of Mexico, during the reorganization of the empire, the Bourbon Reforms. After New Spain achieved independence from the Spanish Empire in 1821 and became a sovereign state, the territory came to be known as the State of Mexico, with the new country being named after its capital: Mexico City, which itself was founded in 1524 on the site of the ancient Mexica capital of Tenochtitlan. The official name of the country has changed as the form of government has changed. The declaration of independence signed on 6 November 1813 by the deputies of the Congress of Anáhuac called the territory América Septentrional (Northern America); the 1821 Plan of Iguala also used América Septentrional. On two occasions (1821–1823 and 1863–1867), the country was known as Imperio Mexicano (Mexican Empire). All three federal constitutions (1824, 1857 and 1917, the current constitution) used the name Estados Unidos Mexicanos—or the variant Estados-Unidos Mexicanos, all of which have been translated as "United Mexican States". The phrase República Mexicana, "Mexican Republic", was used in the 1836 Constitutional Laws.Administrative divisions
The boundaries and constituent units of Mexico evolved over time from its colonial-era origins. Central America peacefully separated from Mexico after independence in 1821. Yucatán was briefly an independent republic. Texas separated in the Texas Revolution and when it was annexed to the U.S. in 1845, it set the stage for the Mexican–American War and major territorial loss to the U.S. The sale of northern territory known in the U.S. as the Gadsden Purchase was the last loss of Mexican territory. The United Mexican States are a federation of 31 free and sovereign states, which form a union that exercises a degree of jurisdiction over Mexico City. Each state has its own constitution, congress, and a judiciary, and its citizens elect by direct voting a governor for a six-year term, and representatives to their respective unicameral state congresses for three-year terms.Mexico City is a special political division that belongs to the federation as a whole and not to a particular state. Formerly known as the Federal District, its autonomy was previously limited relative to that of the states. It dropped this designation in 2016 and is in the process of achieving greater political autonomy by becoming a federal entity with its own constitution and congress. The states are divided into municipalities, the smallest administrative political entity in the country, governed by a mayor or municipal president (presidente municipal), elected by its residents by plurality.
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