San Martín Proclaims Peru’s Independence in Lima

On 28 July 1821, General José de San Martín officially proclaimed the independence of Peru in the Plaza Mayor of Lima. The public declaration followed months of maneuvering along the Pacific coast and in the central valleys, which had successfully destabilized the colonial administration. Manuel Pérez de Tudela drafted the formal Act of Independence, which the inhabitants of the city began signing on 15 July. For the patriot leadership, establishing civil authority in the historic capital of the viceroyalty represented a decisive symbolic break from Spanish imperial rule, yet it did not immediately secure military control over the wider realm.

For decades, the Viceroyalty of Peru had stood as a formidable royalist stronghold in South America. During the upheaval of the Peninsular War and the French occupation of Spain, Viceroy José Fernando de Abascal y Sousa mobilized regional resources and expeditionary forces to put down anti-colonial uprisings across Upper Peru and protect the territory from insurgent incursions from the Río de la Plata. Discontent among native populations and provincial figures had periodically erupted into open revolt, notably in Tacna, Huánuco, and Cuzco between 1811 and 1815. Despite these persistent tensions, the central viceregal apparatus in Lima consistently mobilized loyalist regiments and curacas to preserve the monarchy.