Government Systems Across South America: A Continent of Republics

South America comprises 12 sovereign nations, each with its own constitutional framework. While diverse in history and politics, the continent shares a dominant pattern: presidential republics. There are no monarchies.

Primary Models

• Presidential Republics (Most Common): The President is both Head of State and Head of Government, directly elected for a fixed term (usually 4–6 years). Examples: Brazil, Argentina, Colombia, Chile, Peru, Venezuela, Ecuador, Bolivia, Paraguay, Uruguay. (Note: Some have runoff elections; term limits vary).
• Semi-Presidential / Mixed Systems: Guyana and Suriname have systems where an executive President coexists with a Prime Minister responsible to the legislature, blending presidential and parliamentary features.

Federal vs. Unitary

• Federal Republics: Brazil, Argentina, Venezuela – Power constitutionally divided between central government and states/provinces.
• Unitary Republics: Most others (Chile, Peru, Colombia, etc.) – Central government delegates authority to regions/departments.

Historical Context & Current Dynamics

Military dictatorships (juntas) were prevalent in the 1960s–80s (Brazil, Argentina, Chile, Uruguay). All have transitioned to democracy, though democratic backsliding and institutional crises occur (e.g., Venezuela, Bolivia, Peru recently). Constitutional reforms are frequent (Colombia 1991, Bolivia 2009, Ecuador 2008).

In summary: South America is a continent of written constitutions, elected presidents, and civilian-controlled militaries, with federalism as the main structural variable.