Events in the year 1870 in Argentina.
Incumbents President: Domingo Faustino Sarmiento Vice President: Adolfo Alsina
Governors Buenos Aires Province: Emilio de Castro y Rocha Cordoba: Félix de la Peña Mendoza Province: Nicolás Villanueva (until 16 October); Arístides Villanueva (from 16 October) Santa Fe Province: Mariano Cabal
Vice Governors Buenos Aires Province: vacant
Events 1 March - End of the Paraguayan War. Following this, Argentina seeks to enforce one of the secret clauses of the Treaty of the Triple Alliance, which would have permitted it to annex a large portion of the Gran Chaco region. The Brazilian government, wishing to maintain Paraguay as a buffer with Argentina, it rejects the Argentine proposal.Bareiro Saguier, Ruben; Villagra Marsal, Carlos. Testimonios de la Guerra Grande. Muerte del Mariscal López. Tomo I, Editorial Servilibro. Asuncion, Paraguay, 2007. p 90
Births 21 February – Victor Mercante, educationist (died 1934)UNESCO biography
Deaths 12 March – Pastor Obligado, lawyer, Governor of the secessionist State of Buenos Aires 1853–1858 (born 1818) 11 April – Justo José de Urquiza, politician and general (born 1801)Martínez, Benjamín, Generales de Urquiza, desfile de valientes, ED. Tor, Bs. As., 1932.
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