section_path: Politics/Political structure
section_name: Political structure
paragraph_text: Political structure
  
  The Acta Constitutiva de la Federación of 31 January 1824, and the Federal Constitution of 4 October 1824, fixed the political and administrative organization of the United Mexican States after the Mexican War of Independence. In addition, Section XXVIII of Article 50 gave the new Congress the right to choose where the federal government would be located. This location would then be appropriated as federal land, with the federal government acting as the local authority. The two main candidates to become the capital were Mexico City and Querétaro.
  
  Due in large part to the persuasion of representative Servando Teresa de Mier, Mexico City was chosen because it was the center of the country's population and history, even though Queretaro was closer to the center geographically. The choice was official on 18 November 1824, and Congress delineated a surface area of two leagues square (8,800 acres) centered on the Zocalo. This area was then separated from the State of Mexico, forcing that state's government to move from the Palace of the Inquisition (now Museum of Mexican Medicine) in the city to Texcoco. This area did not include the population centers of the towns of Coyoacán, Xochimilco, Mexicaltzingo and Tlalpan, all of which remained as part of the State of Mexico.
  
  In 1854 president Antonio López de Santa Anna enlarged the area of Mexico City almost eightfold from the original 220 to 1,700 km (80 to 660 sq mi), annexing the rural and mountainous areas to secure the strategic mountain passes to the south and southwest to protect the city in event of a foreign invasion. (The Mexican–American War had just been fought.) The last changes to the limits of Mexico City were made between 1898 and 1902, reducing the area to the current 1,479 km (571 sq mi) by adjusting the southern border with the state of Morelos. By that time, the total number of municipalities within Mexico City was twenty-two. In 1941, the General Anaya borough was merged with the Central Department, which was then renamed "Mexico City" (thus reviving the name but not the autonomous municipality). From 1941 to 1970, the Federal District comprised twelve delegaciones and Mexico City. In 1970, Mexico City was split into four different delegaciones: Cuauhtémoc, Miguel Hidalgo, Venustiano Carranza and Benito Juárez, increasing the number of delegaciones to 16. Since then, the whole Federal District, whose delegaciones had by then almost formed a single urban area, began to be considered de facto a synonym of Mexico City.
  
  The lack of a de jure stipulation left a legal vacuum that led to a number of sterile discussions about whether one concept had engulfed the other or if the latter had ceased to exist altogether. In 1993, the situation was solved by an amendment to the 44th article of the Constitution of Mexico; Mexico City and the Federal District were stated to be the same entity. The amendment was later introduced into the second article of the Statute of Government of the Federal District.
  
  On 29 January 2016, Mexico City ceased to be the Federal District (Spanish: Distrito Federal or D.F.), and was officially renamed "Ciudad de México" (or "CDMX"). On that date, Mexico City began a transition to becoming the country's 32nd federal entity, giving it a level of autonomy comparable to that of a state. It will have its own constitution and its legislature, and its delegaciones will now be headed by mayors. Because of a clause in the Mexican Constitution, however, as it is the seat of the powers of the federation, it can never become a state, or the capital of the country has to be relocated elsewhere.
  
  In response to the demands, Mexico City received a greater degree of autonomy, with the 1987 elaboration the first Statute of Government (Estatuto de Gobierno) and the creation of an assembly of representatives. The city has a Statute of Government, and as of its ratification on 31 January 2017, a constitution, similar to the states of the Union. As part of the recent changes in autonomy, the budget is administered locally; it is proposed by the head of government and approved by the Legislative Assembly. Nonetheless, it is the Congress of the Union that sets the ceiling to internal and external public debt issued by the city government.
  
  The politics pursued by the administrations of heads of government in Mexico City at the end of the 20th century have usually been more liberal than those of the rest of the country, whether with the support of the federal government, as was the case with the approval of several comprehensive environmental laws in the 1980s, or by laws that were since approved by the Legislative Assembly. The Legislative Assembly expanded provisions on abortions, becoming the first federal entity to expand abortion in Mexico beyond cases of rape and economic reasons, to permit it at the choice of the mother before the 12th week of pregnancy. In December 2009, the then Federal District became the first city in Latin America and one of very few in the world to legalize same-sex marriage.