Type: Federal Republic.
Independence: First proclaimed September 16, 1810; Republic established 1824.
Constitution: February 5, 1917.
Branches: Executive--president (Chief of state and head of government). Legislative--bicameral. Judicial--Supreme Court, local and federal systems.
Administrative subdivisions: 31 states and a federal district.
Political parties: Institutional Revolutionary Party (PRI), National Action Party (PAN), Party of the Democratic Revolution (PRD), Green Ecological Party (PVEM), Labor Party (PT), and several small parties.
Suffrage: Universal at 18.