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.
- 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
The PRI held near-hegemonic power for decades, nationalizing key industries and implementing land reforms.
Reader's Guide
Key issues remain crime, corruption, and the economy.
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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