July 28
Peru Declares Independence from Spain
Argentine general José de San Martín formally proclaimed Peru's independence from Spain in Lima's Plaza Mayor on July 28, 1821, amid a gathering of local leaders and citizens.
Summary
After years of colonial rule and amid the broader wave of Latin American independence movements, Argentine general José de San Martín led patriot forces into Lima following the capture of key coastal positions. On July 28, 1821, in the Plaza Mayor, San Martín formally proclaimed Peru's independence from Spanish dominion in a ceremony attended by local leaders and citizens. The declaration asserted that Peru was free by the general will of the people, though full military victory over remaining Spanish forces would not come until 1824 at the Battle of Ayacucho. San Martín assumed the title of Protector of Peru, establishing the foundations for the new republic amid ongoing regional conflicts.
Context
For more than two centuries, the Viceroyalty of Peru served as the administrative and economic center of Spanish South America, governing a vast territory that stretched from modern-day Panama to Chile and generating immense wealth through silver mines and agricultural estates. Napoleon's 1808 invasion of Spain fractured colonial loyalties across the Americas, sparking independence movements fueled by Enlightenment principles and local grievances against restrictive trade policies and peninsular privileges.
What Happened
Building on victories in Argentina and Chile, José de San Martín organized the Liberating Expedition of Peru, which landed on the northern coast in September 1820. His combined naval and land forces captured key ports and coastal positions, prompting the Spanish viceroy to evacuate Lima without a major battle. An open cabildo convened in the capital and produced an Act of Independence that was formally signed in mid-July 1821.
Aftermath
On July 28, San Martín addressed crowds assembled in the Plaza Mayor and declared Peru free and independent by the general will of its peoples. He was subsequently invested with the title of Protector of Peru, establishing a provisional government while royalist armies retained control of the Andean interior.
Legacy
The proclamation accelerated the collapse of Spanish authority on the Pacific coast and contributed to the broader wave of independence that reshaped the continent by 1825. July 28 is observed annually as Peru's Fiestas Patrias, anchoring national identity in the founding act of self-determination.
Why It Matters
Peru's independence severed Spanish control over a vital South American territory rich in resources and population, accelerating the collapse of the Spanish Empire in the Americas. It contributed to the formation of independent nations across the continent and shaped modern Peruvian national identity centered on July 28 celebrations.
Related Questions
Who led the military campaign that enabled Peru's independence declaration?
Argentine general José de San Martín organized and commanded the expedition that secured coastal Peru and entered Lima in 1821.
Where and how was independence formally announced?
San Martín proclaimed it from Lima's Plaza Mayor on July 28, 1821, before an assembly of residents and officials.
When did Peru achieve complete military victory over Spanish forces?
The Battle of Ayacucho on December 9, 1824, delivered the final defeat of royalist armies in Peru.
What title did San Martín hold after the declaration?
He was named Protector of Peru, exercising executive authority until political disputes led to his resignation in 1822.
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Sources
- Peru Declares Its Independence from Spain, Encyclopædia Britannica. Accessed 2026-07-02.