El 25 de Mayo es el Dia de la Revolucion de Mayo en Argentina, commemorating the May Revolution of 1810 when the Viceroyalty of the Rio de la Plata formed its first independent government, the Primera Junta, on May 25, 1810. This is considered the beginning of Argentina's independence process, culminating in formal independence on July 9, 1816.
Argentina's May Revolution Day is May 25th every year.
The Primera Junta was established in Buenos Aires, replacing the Spanish Viceroy and beginning Argentina's path to independence.
May 25 marks the start of the independence process (1810), while July 9 is the formal declaration of independence (1816).