The Machain–Irigoyen Treaty was a border treaty signed in

Buenos Aires Buenos Aires ( or ; ), officially the Autonomous City of Buenos Aires ( es, link=no, Ciudad Autónoma de Buenos Aires), is the capital and primate city of Argentina. The city is located on the western shore of the Río de la Plata, on South ...

on 3 February 1876 between Paraguay and Argentina. Concluded in the aftermath of the Paraguayan War, it was signed by

Facundo Machaín Facundo Machaín (November 26, 1845 – October 29, 1877) was President of Paraguay. His period of government lasted barely one day between August 31 and September 1, 1870, but was important for the political situation and development of the count ...

and Bernardo de Irigoyen. It satisfied most of Argentina’s territorial claims and led to the complete withdrawal of Allied occupational troops from Paraguay by the mid-summer of 1876. Argentina gained the disputed Misiones Province and all the lands south of the

Pilcomayo River Pilcomayo (in Hispanicized spelling) (Quechua Pillkumayu or Pillku Mayu, ''pillku'' red, ''mayu'' river, "red river", Guarani Ysyry Araguay ) is a river in central South America. At long, it is the longest western tributary of the Paraguay River ...

, which forms Formosa Province. Argentina gave up its claims on Villa Occidental. Only the issue of the ''Chaco Boreal'' (Northern Chaco) was left unresolved. Brazil had signed the separate

Loizaga–Cotegipe Treaty The Loizaga–Cotegipe Treaty was a treaty of peace and borders signed in Asunción on 9 January 1872 between Paraguay and Brazil. It established the boundaries between the two countries after Paraguay's defeat in the Paraguayan War. The treaty w ...

with Paraguay in 1872 and sided with Paraguay in its negotiations with Argentina. Paraguay, with Brazilian support, refused to give up Chaco territory, and both sides agreed to international arbitration by American president Rutherford B. Hayes, who, on November 12, 1878, decided in favor of Paraguay. In his honor, the

Presidente Hayes Department Presidente Hayes () is a department in Paraguay. The capital is the city of Villa Hayes. The department was named after U.S. President Rutherford B. Hayes, who awarded the territory to Paraguay while arbitrating a boundary dispute between Par ...

was created. That decision created a scandal in Bolivia, which claimed much of the disputed Chaco region. The unresolved conflict would later lead to the 1932-1935 Chaco War.The War that Changed South America Forever
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* {{DEFAULTSORT:Machain-Irigoyen Treaty History of Paraguay 1876 treaties 1876 in Argentina February 1876 events Argentina–Paraguay relations 1870s in Paraguay Treaties of Paraguay Treaties of Argentina Paraguayan War