Paraguay overthrew the local Spanish administration on 14 May 1811. Paraguay's first dictator was José Gaspar Rodríguez de Francia, who ruled Paraguay from 1814 until his death in 1840 with very little outside contact or influence.[25] He intended to create a utopian society based on the Genevan theorist Jean-Jacques Rousseau's Social Contract.[26] Rodríguez de Francia was nicknamed El Supremo. Rodríguez de Francia established new laws that greatly reduced the powers of the Catholic church (Catholicism was then an established state religion) and the cabinet, forbade colonial citizens from marrying one another and allowed them to marry only blacks, mulattoes or natives, in order to break the power of colonial-era elites and to create a mixed-race or mestizo society.[27] He cut off relations between Paraguay and the rest of South America. Because of Francia's restrictions of freedom, Fulgencio Yegros and several other Independence-era leaders in 1820 planned a coup d'état against Francia, who discovered the plot and had its leaders either executed or imprisoned for life.[28] Rule of the López family[edit] Political map of the region, 1864 After Francia's death in 1840, Paraguay was ruled by various military officers under a new junta militar, until Carlos Antonio López (allegedly Rodríguez de Francia's nephew) came to power in 1841. López modernized Paraguay and opened it to foreign commerce. He signed a nonaggression pact with Argentina and officially declared independence of Paraguay in 1842. After López's death in 1862, power was transferred to his eldest son, Francisco Solano López. The regime of the López family was characterized by pervasive and rigid centralism in production and distribution. There was no distinction between the public and the private spheres, and the López family ruled the country as it would a large estate.[29] The government exerted control on all exports. The export of yerba mate and valuable wood products maintained the balance of trade between Paraguay and the outside world.[30] The Paraguayan government was extremely protectionist, never accepted loans from abroad and levied high tariffs against imported foreign products. This protectionism made the society self-sufficient, and it also avoided the debt suffered by Argentina and Brazil. Slavery existed in Paraguay, although not in great numbers, until 1844, when it was legally abolished in the new constitution.[31]: 39–40  Francisco Solano López, the son of Carlos Antonio López, replaced his father as the President-Dictator in 1862, and generally continued the political policies of his father. Both wanted to give an international image of Paraguay as "democratic and republican", but in fact, the ruling family had almost total control of all public life in the country, including church and colleges.[31]: 41–42  Militarily, Carlos Antonio López modernized and expanded industry and the Paraguayan Army and greatly strengthened the strategic defenses of Paraguay by developing the Fortress of Humaitá.[32] The government hired more than 200 foreign technicians, who installed telegraph lines and railroads to aid the expanding steel, textile, paper and ink, naval construction, weapons and gunpowder industries. The Ybycuí foundry, completed in 1850, manufactured cannons, mortars and bullets of all calibers. River warships were built in the shipyards of Asunción. Fortifications were built, especially along the Apa River and in Gran Chaco.[33]: 22  Following the death of Carlos Antonio López, these projects continued under his son Francisco Solano. In terms of socio-economic development, the country was dubbed "the most advanced Republic in South America", notably by the British judge and politician Sir Robert Phillimore.[34] According to George Thompson, Lieutenant Colonel of Engineers in the Paraguayan Army prior to and during the war, López's government was comparatively a good one for Paraguay: .mw-parser-output .templatequote{overflow:hidden;margin:1em 0;padding:0 32px}.mw-parser-output .templatequotecite{line-height:1.5em;text-align:left;margin-top:0}@media(min-width:500px){.mw-parser-output .templatequotecite{padding-left:1.6em}}Probably in no other country in the world has life and property been so secure as all over Paraguay during his (Antonio Lopez's) reign. Crime was almost unknown, and when committed, immediately detected and punished. The mass of the people was, perhaps, the happiest in existence. They had hardly to do any work to gain a livelihood. Each family had its house or hut in its own ground. They planted, in a few days, enough tobacco, maize and mandioca for their own consumption [...]. Having at every hut a grove of oranges [...] and also a few cows, they were almost throughout the year under little necessity [...]. The higher classes, of course, lived more in the European way...— George Thompson, C.E.[35] Paraguayan War (1864–1870)[edit] Main articles: Paraguayan War and Paraguayan War casualties Francisco Solano López On 12 October 1864, despite Paraguayan ultimatums, Brazil (allied with the Argentine Government under General Bartolomé Mitre and the rebellious Uruguayan colorados led by Gen. Venancio Flores) invaded the Republic of Uruguay in order to overthrow the government of that time (which was under the rule of the Blanco Party, an ally of López),[e] thus starting the Paraguayan War.[f] The Paraguayans, led by the Marshal of the Republic Francisco Solano López, retaliated by attacking Mato Grosso on 15 December 1864 and later declared war against Argentina on 23 March 1865. The Blanco Government was toppled and replaced by a Colorado government under General Venancio Flores on 22 February 1865. Afterward, the Argentine Republic, the Empire of Brazil and the Republic of Uruguay signed the Secret Treaty of the Triple Alliance against the Paraguayan Government on 1 May 1865.[38] On 24 May 1866, the Battle of Tuyutí led to the loss of 6,000 men when a Paraguayan attack was repelled by the Allies. It was marked as the bloodiest battle in South America during the war. The Paraguayans put up a ferocious resistance but ultimately lost in 1870 in the Battle of Cerro Corá, where Marshal Solano López refused to surrender and died in action.[39] The real causes of this war, which remains the bloodiest international conflict in the history of The Americas, are still highly debatable.[g] The Battle of Tuyutí, May 1866 Paraguay lost 25–33% of its territory to Argentina and Brazil, paid an enormous war debt, and sold large amounts of national properties to stabilize its internal budget. The worst consequence of the war was the catastrophic loss of population. At least 50% of Paraguayans died during the conflict, numbers to which it took many decades for the country to return. Of the disaster suffered by the Paraguayans at the outcome of the war, 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."[40] During the pillaging of Asunción in 1869, the Imperial Brazilian Army packed up and transported the Paraguayan National Archives to Rio de Janeiro.[41][h] Brazil's records from the war have remained classified. This has made Paraguayan history in the colonial and early national periods difficult to research and study.[42] 20th century[edit] Gran Chaco was the site of the Chaco War (1932–35), in which Bolivia lost most of the disputed territory to Paraguay In 1904 the Liberal revolution against the rule of Colorados broke out. The Liberal rule started a period of great political instability. Between 1904 and 1954 Paraguay had thirty-one presidents, most of whom were removed from office by force.[43] Conflicts between the factions of the ruling Liberal party led to the Paraguayan Civil War of 1922. The unresolved border conflict with Bolivia over the Chaco region finally erupted in the early 1930s in the Chaco War. After both sides suffered great losses, Paraguay defeated Bolivia and established its sovereignty over most of the disputed Chaco region. After the war, military officers used popular dissatisfaction with the Liberal politicians to seize the power for themselves. On 17 February 1936, the February Revolution brought colonel Rafael Franco to power. Between 1940 and 1948, the coun