The Treaty of Pilar, signed in 1820, established the federalist foundation for Argentina's national organization and is cited as a pre-existing pact in the 1853 Constitution.
Key Facts
- Date signed
- 23 February 1820
- Signing provinces
- Santa Fe, Entre Ríos, Buenos Aires
- Constitutional reference
- Cited in Preamble of Argentine Constitution of 1853
- Congress location proposed
- San Lorenzo, Santa Fe
- Congress timeline
- 60 days after signing
- Excluded leader
- José Gervasio Artigas, denounced pact as treason
By the Numbers
Location
Cause → Event → Consequence
The Battle of Cepeda caused the dissolution of Argentina's national government, leaving the provinces of Santa Fe, Entre Ríos, and Buenos Aires in conflict. The federalist forces of López and Ramírez had defeated the centralist government, creating a power vacuum that demanded a negotiated settlement among the victorious provincial leaders.
On 23 February 1820, governors Estanislao López (Santa Fe), Francisco Ramírez (Entre Ríos), and Manuel de Sarratea (Buenos Aires) signed the Treaty of Pilar in the city of Pilar. The pact established national unity, an end to hostilities, military withdrawal from Buenos Aires, a general amnesty, free navigability of the Paraná and Uruguay rivers, and called for a federalist congress at San Lorenzo.
The treaty is recognized as the foundation of Argentina's federal organization and was explicitly acknowledged in the Preamble of the 1853 Argentine Constitution. It was soon followed by the Treaty of Benegas, realigning Santa Fe and Buenos Aires against Entre Ríos, and two years later by the broader Quadrilateral Treaty. Artigas, excluded from negotiations, condemned his former allies for what he viewed as a betrayal.
Political Outcome
Established federalist principles, ended inter-provincial hostilities, granted amnesty, and mandated a congress to form a federal government; recognized as a foundational pact in the 1853 Argentine Constitution.
Centralist national government dissolved after Battle of Cepeda
Federalist provincial arrangement with congress planned to formalize federal government