Politics of Mexico
Mexico's politics evolved from single-party rule to multi-party democracy.
The politics of Mexico function within the framework of a federal presidential representative democratic republic, based on a multi-party congressional system. The government is divided into three branches—executive, legislative, and judicial—as established by the 1917 Constitution. The executive branch is led by the President, who serves as both head of state and head of government, advised by a cabinet of secretaries independent of the legislature. Legislative power rests with the bicameral Congress of the Union, composed of the Senate and the Chamber of Deputies. The judiciary includes the Supreme Court of Justice, the Council of the Federal Judiciary, and various lower tribunals. Constituent states must also maintain republican governments with congressional systems under their own constitutions.
The modern political framework emerged from the Mexican Revolution (1910–1920), which ended the dictatorship of Porfirio Díaz. Following a period of military influence and failed reforms, President Lázaro Cárdenas (1934–40) transformed the ruling party into the Party of the Mexican Revolution, organized on a corporate basis with sectors for peasants, labor, the popular sector, and the military. In 1946, this became the Institutional Revolutionary Party (PRI), which dominated Mexican politics for decades. The late 1960s saw protests against PRI rule, met with a violent crackdown culminating in the 1968 Tlatelolco Massacre. Economic instability in the 1980s prompted market reforms and gradual democratic transition, though early electoral reforms under President Miguel de la Madrid faced internal opposition. The 1988 elections, won by Carlos Salinas de Gortari, were widely considered fraudulent, leading to the creation of the Party of the Democratic Revolution by dissident PRI members. In response, the Federal Electoral Institute was established in 1990 to oversee elections independently. Today, political parties must register with the National Electoral Institute, receive public funding, and obtain at least 3% of votes to maintain registration. Major parties include the National Action Party (PAN), PRI, Green Ecological Party, Labor Party, Citizens’ Movement, and National Regeneration Movement.
- Government type
- Federal presidential representative democratic republic
- Branches
- Executive, legislative, judicial
- Legislature
- Congress of the Union (Senate and Chamber of Deputies)
- Dominant party (20th century)
- Institutional Revolutionary Party (PRI)
- Electoral authority
- National Electoral Institute (INE)
Lore & Background
For much of the twentieth century, Mexican politics were dominated by a single party that evolved from the political organization founded by Plutarco Elías Calles following a period of instability after the Mexican Revolution. This party, initially called the Partido Nacional Revolucionario, was restructured under President Lázaro Cárdenas into the Partido de la Revolución Mexicana, which was organized on a corporate basis with divisions for peasants, labor, the popular sector, and the military. In 1946, it became the Institutional Revolutionary Party (PRI), and the military was removed as a sector. Under the PRI, the government nationalized key industries, including oil, and implemented land reforms that redistributed property to peasants. The party’s near-hegemonic rule was marked by authoritarian tendencies, and the government responded to protests from students and left-wing groups in the late 1960s and early 1970s with a crackdown that culminated in the Tlatelolco Massacre of 1968. Economic instability and market restructuring policies in the 1980s prompted gradual political reforms. The 1988 elections, won by Carlos Salinas de Gortari, were regarded as the most fraudulent in Mexico’s history, leading to the creation of the Party of the Democratic Revolution by PRI members who rejected pro-market reforms. Subsequently, the administration of elections was removed from the interior ministry, and the Instituto Federal Electoral was created in 1990 to ensure free and fair elections.
Reader's Guide
Key issues remain crime, corruption, and the economy. The political system is a federal presidential representative democratic republic with a multi-party congressional framework. The president serves as both head of state and head of government, leading an executive branch advised by a cabinet of secretaries independent of the legislature. Legislative power rests in a bicameral Congress, comprising a Senate and a Chamber of Deputies. The judiciary includes the Supreme Court, the Council of the Federal Judiciary, and various tribunals. The modern political order emerged from the Mexican Revolution, which ended a dictatorship and produced the Constitution of 1917. A subsequent semi-authoritarian regime saw the founding of a dominant party, initially the National Revolutionary Party, later reorganized under President Lázaro Cárdenas into the Party of the Mexican Revolution with corporate sectors for peasants, labor, the popular sector, and the military. This party eventually became the Institutional Revolutionary Party (PRI), which nationalized key industries and enacted land reforms. Authoritarian rule faced protests in the late 1960s, met with a deadly crackdown. Market reforms and gradual democratic reforms began in the 1980s, though early electoral efforts were unsuccessful. The 1988 election was widely considered fraudulent, leading to the creation of an independent electoral institute. Political parties must register with the National Electoral Institute, secure at least three percent of the vote to maintain registration, and receive public funding. Major parties include the PAN, PRI, Green Ecological Party, Labor Party, Citizens’ Movement, and National Regeneration Movement. Parties may form coalitions for elections.
Constitutional Architecture and the Three Branches
Under this framework, the President serves simultaneously as head of state and head of government, wielding executive authority alongside a cabinet of secretaries who operate independently of the legislature. Legislative authority is housed in the Congress of the Union, a bicameral body made up of the Senate of the Republic and the Chamber of Deputies. Judicial power is distributed across the Supreme Court of Justice of the Nation, the Council of the Federal Judiciary, and a network of collegiate, unitary, and district tribunals. The constitution further mandates that each of the federation's constituent states maintain a republican government organized around a congressional system, as defined in their own state constitutions. This multi-party congressional structure means no single chamber holds absolute dominance, and the interplay among the three branches—executive, legislative, and judicial—forms the backbone of Mexican governance.
From Revolution to Institutional Rule
That crisis prompted Calles to found the Partido Nacional Revolucionario, designed both to stabilize the immediate succession and to create a durable mechanism for orderly presidential transitions. The PRM functioned as an extension of the state, mediating conflicts among competing social groups. During this era the government nationalized key industries including oil and carried out sweeping land redistribution to peasants.
Repression, Fraud, and the Road to Democratic Transition
Mexico's second half of the twentieth century was shaped by deep political tension and growing economic fragility. In the late 1960s and early 1970s, students and left-wing groups mounted sustained protests against the PRI's authoritarian grip.
The Modern Party Landscape and Electoral Rules
Mexican law requires every political party to promote popular participation in democratic life, contribute to national representation, and serve as the channel through which citizens can access public office. All parties must register with the National Electoral Institute, which organizes and oversees federal electoral processes, and they must secure at least three percent of the vote in federal elections to retain their registration. Registered parties receive public funding and may also accept private contributions within legal limits. Parties may form coalitions under a shared name and logo to nominate candidates; proportional-representation seats are allocated to the coalition based on its vote share and then redistributed among member parties, though coalition partners need not continue governing together. Throughout the twentieth century the PRI enjoyed near-hegemonic control at both state and federal levels, a dominance that began eroding in the late 1980s.
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