Question:  The Sociedad de Beneficencia de Buenos Aires was created by the president of a nation once called what?

Context paragraphs:
University of Buenos Aires: The University of Buenos Aires (Spanish: "Universidad de Buenos Aires" , UBA) is the largest university in Argentina and the second largest university by enrollment in Latin America.  Founded on August 12, 1821 in the city of Buenos Aires, it consists of 13 departments, 6 hospitals, 10 museums and is linked to 4 high schools: Colegio Nacional de Buenos Aires, Escuela Superior de Comercio Carlos Pellegrini, Instituto Libre de Segunda Enseñanza and "Escuela de Educación Técnica Profesional en Producción Agropecuaria y Agroalimentaria".

Buenos Aires Carnival: The Buenos Aires Carnival (Spanish: "Carnaval de Buenos Aires" or "Corso de Buenos Aires" ) is an annual event that takes place during the Carnival festivities, usually at the end of February, on the streets of Buenos Aires, Argentina.  The two-day event features murga parades, colourful customs, water bombs and many other amusement activities.

Manila Village: Manila Village was a settlement of Filipino sailors, fishermen and laborers located on an island in Barataria Bay, in Jefferson Parish, Louisiana, United States.  Settlements such as Manila Village and Saint Malo in St. Bernard Parish were founded in the mid-19th century (or earlier).  The fishermen caught and dried their precious commodity, shrimp, for export to Asia, Canada, South America, and Central America.  On July 24, 1870, the Spanish-speaking residents of St. Malo founded the first Filipino social club, called Sociedad de Beneficencia de los Hispano Filipinos, to provide relief and support for the group’s members, including the purchasing of burial places for their deceased.

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.

Magda Frank: Magda Frank Fischer (July 20, 1914 – June 23, 2010) was a Hungarian-Argentine sculptor.  She was born in Kolozsvár, Transylvania, which at that time belonged to Hungary but in 1918, was incorporated into Romania.  Because of Nazi persecution, she left Hungary to settle in Switzerland.  Years later, she moved to Paris to study at the Académie Julian.  In 1950, she arrived in Buenos Aires, Argentina to visit her brother, her only living family member.  Here, she was appointed professor at the Artes Visuales de Buenos Aires and exhibited at the Galería Pizarro.  She participated in the Premio Palanza Buenos Aires.  She received the Benito Quinquela Martín award at the Eduardo Sívori Museum, and was honored by the Argentine Senate.  Her works are part of the collections at the Musée National d'Art Moderne in Paris, the National Museum of Fine Arts in Paris, the National Museum of Fine Arts in Buenos Aires.  Frank resettled in Argentina in 1995 and built the Magda Frank House Museum in the Saavedra barrio at Vedia 3546.  She died in 2010 in Buenos Aires, Argentina.

Sociedad de Beneficencia de Buenos Aires: The Sociedad de Beneficencia de Buenos Aires, also known as Sociedad de Damas de Beneficencia, or Sociedad de Beneficencia, was an Argentine charitable organization.  The association was created by president Bernardino Rivadavia in 1823.  The purpose was to transfer social work from the Catholic church to the association after the Argentine independence.

Agustina Ortiz de Rozas: Agustina Ortiz de Rozas (1826-1898) was an Argentine philantropist and political figure, president of the Sociedad de Beneficencia.  She was the youngest sister of the general Juan Manuel de Rosas and was born in Buenos Aires.  Ortiz married Lucio Norberto Mansilla at 15 years of age and had the following children with him: Lucio Victorio, Eduarda, Lucio Norberto, Agustina and Carlos.  She was renowned as one of the most beautiful women of her time according to many of her contemporaries.  She played some role in Argentina's founding.

Flora Azcuénaga: Flora Azcuénaga (1767-1850) was an Argentinian philanthropist.  In 1823, she was one of the founders of the famous philanthropic society "Sociedad de Beneficencia".

Buenos Aires City Legislature: The Buenos Aires City Legislature (Spanish: "Legislatura de la Ciudad Autónoma de Buenos Aires" , commonly known as the "Legislatura Porteña") is a central part of the Government of the City of Buenos Aires, Argentina.  It is housed in the Palacio de la Legislatura de la Ciudad de Buenos Aires, an architectural landmark in the city's Montserrat section.

Mercedes Lasala: Mercedes Lasala (1763-1837) was an Argentinian philanthropist.  In 1823, she was one of the founders of the famous philanthropic society "Sociedad de Beneficencia", and also served its first chairperson.  She belonged to the "Patricias Argentinas", a group of female financiers who contributed in financing the Argentine war of independence in 1812.

Supporting paragraphs: Sociedad de Beneficencia de Buenos Aires Bernardino Rivadavia
Answer: United Provinces of Rio de la Plata