Legislative Dynamics in Latin American Political Institutions
Summary
The legislative landscape across Latin America is characterised by a complex interplay between executive authority, legislative chambers and party coalitions. Democracies in the region vary from unicameral to bicameral systems, each with distinct mechanisms of representation and revision. Presidential powers—including agenda setting, veto prerogatives and urgency instruments—shape the pace and content of lawmaking, while party fragmentation and coalition building determine majorities within legislatures. Constitutional reforms over the last three decades have recalibrated the balance of power, affecting the origin and success rates of bills as well as the negotiation strategies between the executive and legislative branches. These developments have global significance for understanding how emerging and consolidated democracies manage policy stability, government accountability and institutional resilience. Concrete examples from Mercosur trade agreements to constitutional change in Chile illustrate the diversity of legislative procedures and the strategic use of procedural rules, highlighting the mutual adjustment between institutional design and political behaviour across the region.
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Technical terms
Bicameralism: A legislative system composed of two separate chambers that must both approve legislation.
Legislative agenda: The set of bills and policy proposals that an actor seeks to prioritise in a legislature.
Coalition: An alliance of political parties or legislators formed to secure a legislative majority.
Urgency prerogative: A procedural mechanism enabling the executive to accelerate parliamentary consideration of a bill.
Partial veto: The power of an executive to reject specific provisions within a bill while approving the remainder.
Presidential dominance: The concentration of legislative initiative and control within the executive branch.
References
- Duration of the legislative approvals of international agreements: Evidence from Mercosur. Revista Brasileira de Política Internacional (2024).
- Where did Hyper-Presidentialism Go? The Origin of Bills and Laws Passed in Chile, 1990–2022. Journal of Politics in Latin America (2024).
- Partial Presidential Vetoes and Executive–Legislative Bargaining: Chile, 1990–2018. Latin American Politics and Society (2023).
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