What was the capital of the union of provinces in the Río de la Plata comprised by most of the former dependencies from the last to be organized and also the shortest-lived of the Viceroyalties of the Spanish Empire in the Americas?
United Provinces of the Rio de la Plata The United Provinces of the Río de la Plata (Spanish: "Provincias Unidas del Río de la Plata" ), earlier known as the United Provinces of South America (Spanish: "Provincias Unidas de Sudamérica" ), a union of provinces in the Río de la Plata region of South America, emerged from the May Revolution in 1810 and the Argentine War of Independence of 1810–1818. It comprised most of the former Viceroyalty of the Río de la Plata dependencies and had Buenos Aires as its capital.
Pascual Ruiz Huidobro Pascual Ruiz Huidobro (Ourense, Galicia, 1752 – Mendoza, Argentina, March 1813), was a Spanish soldier in the Viceroyalty of the Río de la Plata, who fought against the British invasions of the Río de la Plata as Governor of Montevideo.