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In April more than 100,000 people demonstrated in Buenos Aires in support of Juan Carlos Blumberg, father of murdered student Axel Blumberg, demanding harsher criminal laws.

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The Treaty of Peace and Friendship of 1984 between Chile and Argentina ends border dispute over Picton, Nueva and Lennox islands.

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Argentina hosted and won the 1978 Football World Cup.

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The Process of National reorganization military government led by Jorge Videla repressed political and armed opposition through use of torture, forced disappearance and extrajudicial killing up of to 30,000 people.

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Start of War of the Triple Alliance between Paraguay and the Triple Alliance of Argentina, Brazil and Uruguay, leading to utter defeat of Paraguay by 1870

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Deputies from the eastern bank of the Río de la Plata declare independence from Brazil, leading to the Cisplatine War. The 1827 Battle of Ituzaingósaw tactical success for Argentina. The war ended in 1828 with a treaty giving independence to Uruguay.

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Secret meetings in May 1810 organised a petition for an open meeting. The petition was refused by viceroy Baltasar Hidalgo,  but popular protest forced his hand on 22 May.

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British invasions of the Río de la Plata unsuccessfully attempt to establish control over Spain's southern colonies as part of the Napoleonic Wars. Spanish troops offer no defence but British repelled by local civilians and militias.

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Spanish navigator Juan Diaz de solis first European explorer to visit Rio de la Plata , on territory which is now Argentina, Díaz de Solís killed and supposedly cannibalised by natives.

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Irrigation permitted development of sedentary agricultural of staple crops in western and northwestern Andean region.