Viceroyalty of the Río de la Plata
The Viceroyalty of the Río de la Plata (Spanish: Virreinato del Río de la Plata or Spanish: Virreinato de las Provincias del Río de la Plata) was the shortest-lived of the Viceroyalties of the Spanish Empire in the Americas. It was the last to be organized. Its name means "River of the Silver",  It was also called "Viceroyalty of the River Plate" in some writings.   The name "Provincias del Río de la Plata" was formally adopted in 1810 during the Cortes of Cádiz to name the Viceroyalty of the Río de la Plata.