Key Facts
- Duration
- 1836–1839 (approx. 3 years)
- Constituent states
- North Peru, South Peru, Bolivian Republic
- Supreme Protector
- Marshal Andrés de Santa Cruz
- Founding pact
- Pact of Tacna, 1 May 1837
- Dissolution
- 25 August 1839, Battle of Yungay
Imperial Zenith Metrics
Historical Trajectory
Phase I: Rise
The Confederation emerged from the instability of post-independence Peru, following the Peruvian Civil War of 1834 and the Salaverry–Santa Cruz War of 1835–36. Bolivian president Marshal Andrés de Santa Cruz unified North Peru, South Peru, and Bolivia into a loose confederation, formally established on 28 October 1836 and institutionally ratified by the Pact of Tacna on 1 May 1837, with Santa Cruz assuming the role of Supreme Protector.
Phase II: Zenith
At its height, the Confederation encompassed the territories of present-day Peru and Bolivia, and Bolivia extended its reach into disputed areas of northern Argentina in 1838. The state also exercised authority over de facto autonomous indigenous territories such as Iquicha. Santa Cruz sought to project regional influence and posed a sufficient economic and military challenge that both Chile and Argentina viewed it as a direct threat to their sovereignty.
Phase III: Decline
Chile and Argentina, perceiving the Confederation as a destabilizing force and objecting to its support for exiled dissidents, backed the United Restoration Army under Agustín Gamarra and Chilean general Manuel Bulnes. This coalition defeated the Confederate Army at the Battle of Yungay on 20 January 1839. Gamarra declared the Confederation dissolved on 25 August 1839, ending Santa Cruz's project and restoring separate Peruvian and Bolivian states.
Notable Imperial Reigns
Selected rulers mapping the empire’s trajectory