Argentina’s Independence Day is 9 July, commemorating the 1816 declaration in San Miguel de Tucumán.
On 9 July 1816, the Congress of Tucumán declared the United Provinces of South America independent from Spanish rule. The declaration followed the May Revolution of 1810 and years of political and military conflict in the Río de la Plata region.
The congress met in San Miguel de Tucumán, a city in northwestern Argentina. José de San Martín, the military leader of the independence campaigns, supported the push for a formal declaration while preparing operations across the Andes.
Argentina’s 25 May holiday remembers the formation of the first autonomous government in Buenos Aires in 1810, not the final declaration of independence. That distinction explains why both May and July feature prominently in Argentina’s national calendar.