the very brief ownership of various military officers under a new junta, until the secretary Carlos Antonio Lopez, Francia's nephew, declared himself dictator. Lopez modernized Paraguay, and opened it up to foreign commerce. The relationship with Buenos Aires was limited to a non-aggression pact; Paraguayan independence from Argentina was declared in 1842. After Lopez's death, power was transferred to his eldest son, Francisco Solano López in 1862.
The Paraguayan War commenced in 1864. Paraguay fought against Brazil, Argentina and Uruguay, and was defeated in 1870 after five years of the bloodiest war in South America. William D. Rubinstein wrote: "The normal estimate is that of a Paraguayan population of somewhere between 450,000 and 900,000, only 220,000 survived the war, of whom only 28,000 were adult males." Paraguay also suffered extensive territorial losses to Brazil and Argentina.
The Battle of Tuyutí, May 1866.
The Chaco War was fought with Bolivia in the 1930s, and Bolivia was defeated. Paraguay re-established sovereignty over the region called the Chaco, but forfeited additional territorial gains as a price of peace.
The official narrative of Paraguay's history is fraught with disputes among historians, educators and politicians. The "authentic" version of historical events, wars in particular, varies depending on whether it was written in Paraguay, Argentina, Uruguay, Brazil, Bolivia, Europe, or North America.
Both the Colorado Party and Liberal Party maintain distinct official versions of Paraguayan history. During the pillaging of Asuncion (Saqueo de Asunción) in 1869, the Brazilian Imperial Army ransacked and relocated the Paraguayan National Archives to Rio de Janeiro where they have been kept in secrecy, making Paraguayan history in the Colonial and early National periods difficult to study.
20th century
Between 1904 and 1954, Paraguay had thirty-one
