Events in the year 1864 in Argentina.
Incumbents
President: Bartolomé Mitre
Vice President: Marcos Paz
Governors
Buenos Aires Province: Mariano Saavedra
Cordoba: Roque Ferreyra (starting month unknown) Mendoza Province: Carlos González Santa Fe Province: Patricio Cullen
Vice Governors
Buenos Aires Province: vacant
Events
10 August – Uruguayan War: War breaks out between Brazil and Uruguay, despite negotiations involving Argentine Foreign Minister Rufino de Elizalde. 25 October – establishment of General Las Heras Partido 13 December – Paraguayan War: Paraguay declares war on Brazil; war with Argentina follows three months later. The classic aperitif Hesperidina is invented by American immigrant Melville Sewell Bagley in Buenos Aires.
Deaths
30 October – Jonas Coe ("Comodoro Juan Coe"), US naval commander and supporter of Juan Manuel de Rosas (born 1805).
References
1860s in Argentina
History of Argentina (1852–1880) Years of the 19th century in Argentina