Question:  The Sociedad de Beneficencia de Buenos Aires was created by the president of a nation once called what?
Sentence (from "Bernardino Rivadavia"): Bernardino de la Trinidad González Rivadavia y Rivadavia (May 20, 1780 – September 2, 1845) was the first President of Argentina, then called the United Provinces of Rio de la Plata, from February 8, 1826 to June 27, 1827.
Relevant evidence: Yes