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These are the selected anniversaries for April that appear on the Argentina portal. The "edit" links edit the portal subpages that are displayed as sections here.
April 1
- 1801: Founding of Telégrafo Mercantil, the first newspaper edited in Buenos Aires
- 1856: Death of general Eustaquio Díaz Vélez
- 1908: Establishment of Club Atlético San Lorenzo de Almagro
- 1990: Death of football player Carlos Peucelle
April 2
- 1822: Birth of president Luis Sáenz Peña
- 1892: Presidency declares the state of emergency in Buenos Aires
- 1982: 1982 invasion of the Falkland Islands. April 2 became the Malvinas Day.
- 1992: The Argentine Currency Board comes into force
April 3
- 1588: Establishment of Corrientes
- 1819: Hipólito Bouchard captures 4 Spanish ships in Nicaragua
- 1829: Peace treaty between Córdoba and San Luis provinces
- 1905: Establishment of soccer team Boca Juniors
April 4
- 1823: General Martín Rodríguez established the city of Tandil
- 1874: Death of governor Felipe Llavallol
- 1949: Death of explorer Lucas Bridges
- 1964: Establishment of the Universidad Argentina John F. Kennedy
April 5
- 1818: José de San Martín secures the independence of Chile at the battle of Maipú
- 1827: Carlos María de Alvear defeats a Brazilian force at the battle of Camacuá
- 1849: Death of general Mariano Necochea
- 1990: The Supreme Court of Argentina is expanded from five members to nine.
April 6
- 1661: Establishment of the Royal Audiencia of Buenos Aires
- 1811: Forces loyal to Cornelio Saavedra remove the supporters of Mariano Moreno from the Junta Grande
- 1852: Signing of the Protocol of Palermo, which gave Justo José de Urquiza the management of the international relations of the Argentine Confederation
- 1987: Pope John Paul II visits Argentina for the second time
April 7
- 1849: Death of Pedro Ignacio de Castro Barros, who took part in the Congress of Tucumán
- 1852: Establishment of Avellaneda
- 1890: Birth of writer Victoria Ocampo
- 1894: Juan B. Justo founds the socialist newspaper La Vanguardia
April 8
- 1818: Execution of the Chileans Juan José Carrera and Luis Carrera
- 1845: Death of lawyer Gregorio García Tagle
- 1879: Jorge Fontana establishes the city of Formosa
- 1880: Death of general Ignacio Rivas
April 9
- 1812: International trade of slaves is forbidden
- 1815: Death of colonel Tomás de Allende
- 1819: Death of Mariano Boedo, member of the Congress of Tucumán
- 1953: Suicide of Juan Duarte, brother of Eva Perón and secretary of Juan Perón
April 10
- 1853: Death of colonel Mariano José de Gainza
- 1871: Death of general Lucio Mansilla
- 1887: Birth of Nobel-winner Bernardo Houssay
- 1982: 300,000 people in Plaza de Mayo support the Malvinas War
April 11
- 1804: Death of viceroy Joaquín del Pino
- 1828: Colonel Ramón Estomba establishes the city of Bahía Blanca
- 1854: Sanction of the constitution of the state of Buenos Aires
- 1870: Murder of Justo José de Urquiza
April 12
- 1829: José María Paz invades Córdoba
- 1862: Bartolomé Mitre is appointed president of Argentina
- 1871: Sanction of a new constitution of the San Luis Province
- 1995: Death of football player Adolfo Pedernera
April 13
- 1813: The Assembly of the Year XIII establishes new currency
- 1832: Death of colonl Juan José Quesada
- 1847: Birth of painter Eduardo Sívori
- 1890: Establishment of the Radical Civic Union
April 14
- 1748: Establishment of San Nicolás de los Arroyos
- 1820: Death of José Antonio Cabrera, member of the Congress of Tucumán
- 1909: Death of president Miguel Ángel Juárez Celman
- 1917: Birth of economist José Ber Gelbard
April 15
- 1817: Royalist general José de la Serna invades Salta
- 1847: Death of colonel José María Aguirre
- 1907: Establishment of Unión de Santa Fe football club
- 1953: Terrorist attack in Plaza de Mayo, during a speech of Juan Perón
April 16
- 1782: Birth of general Toribio de Luzuriaga
- 1821: Portugal accepts the Argentine Declaration of Independence
- 1879: Begin of the Conquest of the Desert
- 1987: Military mutiny of Carapintadas
April 17
- 1823: Birth of governor José María Cullen
- 1849: Death of Pedro Ignacio de Castro Barros, member of the Congress of Tucuman
- 1901: Birth of economist Raúl Prebisch
- 1951: Establishment of the Instituto Antártico Argentino
April 18
- 1824: Death of colonel José Moldes
- 1855: Sanction of the first constitution of San Luis
- 1879: Birth of historian Carlos Ibarguren
- 1995: Death of president Arturo Frondizi
April 19
- 1593: Establishment of San Salvador de Jujuy
- 1825: The Thirty-Three Orientals begin the liberation of Uruguay from Brazilian rule
- 1867: Birth of journalist Roberto Payró
- 1987: Aldo Rico surrenders, ending the Carapintada revolt
April 20
- 1811: Sanction of the first freedom of the press law in Argentina
- 1858: Death of engineer Felipe Senillosa
- 1863: First works at the Central Argentine Railway
- 1965: Death of politician Alfredo Palacios
April 21
- 1790: Birth of admiral Manuel Blanco Encalada
- 1880: The body of José de San Martín leaves France, for the repatriation to Argentina
- 1937: Bith of actor Javier Portales
- 1948: Death of musician Carlos López Buchardo
April 22
- 1819: Sanction of the Argentine Constitution of 1819 in Buenos Aires
- 1819: Death of Saturnino José Rodríguez Peña
- 1847: Birth of general Manuel Campos
- 1892: Establishment of Santa Rosa, La Pampa
April 23
- 1804: Rafael de Sobremonte is appointed interim viceroy
- 1829: Brazilian troops leave Montevideo after the 1828 Treaty of Montevideo
- 1884: First telegraph line between Buenos Aires and Asunción, Paraguay
April 24
- 1769: Birth of Pedro Medrano, member of the Congress of Tucumán
- 1815: Birth of historian Vicente Fidel López
- 1877: Birth of politician José Ingenieros
- 1884: Establishment of Tres Arroyos
April 25
- 1863: Construction of the Central Argentine Railway
- 1931: Former president Marcelo T. de Alvear returns from Europe
- 1957: Death of writer Arturo Cancela
- 1982: British reconquest of the South Georgia and the South Sandwich Islands
April 26
- 1821: First sugar industry in Tucuman
- 1829: Federal victory at the Battle of Márquez Bridge
- 1884: Establishment of Venado Tuerto
- 1949: Birth of football player and coach Carlos Bianchi
April 27
- 1857: Opening of Teatro Colón
- 1927: Birth of comedian Tato Bores
- 1956: Pedro Eugenio Aramburu repeals the Argentine Constitution of 1949 and restores the 1853 one
- 2003: Carlos Menem won the 2003 general election, but did not run for a required ballotage
April 28
- 1800: Birth of general Prudencio Ortiz de Rozas
- 1804: Smallpox epidemic in Buenos Aires
- 1804: Construction of the "Coliseo Provisional" theater in Buenos Aires
- 1858: Birth of writer Martiniano Leguizamón
April 29
- 1808: The Buenos Aires Cabildo rejects the pretensions of Carlota Joaquina over the city
- 1932: Death of de facto president José Félix Uriburu
- 1936: Birth of poet Alejandra Pizarnik
- 1986: Death of economist Raúl Prebisch
April 30
- 1775: Birth of Nicolás Rodríguez Peña, member of the Second Triumvirate
- 1874: Murder of gaucho Juan Moreira
- 1955: Birth of vice president Julio Cobos
- 2011: Death of writer Ernesto Sábato