Question: What secessionist republic resulting from the overthrow of the Argentine Confederation government signed The Pact of San José de Flores?

full_context: Document 1: Juan Manuel de Rosas: Juan Manuel de Rosas (30 March 1793 – 14 March 1877), nicknamed "Restorer of the Laws", was a politician and army officer who ruled Buenos Aires Province and briefly the Argentine Confederation. Although born into a wealthy family, Rosas independently amassed a personal fortune, acquiring large tracts of land in the process. Rosas enlisted his workers in a private militia, as was common for rural proprietors, and took part in the disputes that led to numerous civil wars in his country. Victorious in warfare, personally influential, and with vast landholdings and a loyal private army, Rosas became a caudillo, as provincial warlords in the region were known. He eventually reached the rank of brigadier general, the highest in the Argentine army, and became the undisputed leader of the Federalist Party.
Document 2: Battle of Caseros: The Battle of Caseros was fought near the town of Caseros, Buenos Aires Province, Argentina, on 3 February 1852, between the Army of Buenos Aires commanded by Juan Manuel de Rosas and the Grand Army ("Ejército Grande") led by Justo José de Urquiza. The forces of Urquiza, "caudillo" and governor of Entre Ríos, defeated Rosas, who fled to the United Kingdom. This defeat marked a sharp division in the history of Argentina. As provisional Director of the Argentine Confederation, Urquiza sponsored the creation of the Constitution in 1853, and became the first constitutional President of Argentina in 1854.
Document 3: Pact of San José de Flores: The Pact of San José de Flores ("Pacto Unión San José de Flores", or "Pacto de Unión Nacional") was a treaty signed between the Argentine Confederation and the State of Buenos Aires on November 11, 1859, on the aftermath of the Battle of Cepeda. It established guidelines for the entry of the latter into the Confederation, and Buenos Aires' acceptance of the Argentine Constitution of 1853.
Document 4: List of heads of state of Argentina: Argentina has had many different types of heads of state, as well as many different types of government. During Pre-Columbian times the territories that today form Argentina were inhabited by nomadic tribes, without any defined government. During the Spanish colonization of the Americas, the King of Spain retained the ultimate authority over the territories conquered in the New World, appointing viceroys for local government. The territories that would later become Argentina were first part of the Viceroyalty of Peru, and then the Viceroyalty of the Río de la Plata. The May Revolution started the Argentine War of Independence by replacing the viceroy Baltasar Hidalgo de Cisneros with the first national government. It was the Primera Junta, a junta of several members, which would grow into the Junta Grande with the incorporation of provincial deputies. The size of the Juntas gave room to internal political disputes among their members, so they were replaced by the First and Second Triumvirate, of three members. The Assembly of the Year XIII created a new executive authority, with attributions similar to that of a head of state, called the Supreme Director of the United Provinces of the Río de la Plata. A second Assembly, the Congress of Tucumán, declared independence in 1816 and promulgated the Argentine Constitution of 1819. However, this constitution was repealed during armed conflicts between the central government and the "Federal League" Provinces. This started a period known as the "Anarchy of the Year XX", when Argentina lacked any type of head of state.
Document 5: Argentine Confederation: The Argentine Confederation (Spanish: "Confederación Argentina") is one of the official names of Argentina according to the Argentine Constitution, Article 35. It was the name of the country from 1831 to 1852, when the provinces were organized as a confederation without a head of state. The governor of Buenos Aires Province (Juan Manuel de Rosas during most of the period) managed foreign relations during this time. Under his rule, the Argentine Confederation resisted attacks by Brazil, Bolivia, Uruguay, France and the UK, as well other Argentine factions during the Argentine Civil Wars.
Document 6: Pact for Mexico: The Pact for Mexico is a national political agreement signed on December 2, 2012 in the Chapultepec Castle in Mexico City by the president of Mexico, Enrique Peña Nieto, as well as Gustavo Madero Muñoz, the president of the National Action Party; Cristina Díaz, the acting chair of the Institutional Revolutionary Party; and Jesús Zambrano Grijalva, chair of the Party of the Democratic Revolution. The Green Party of Mexico joined as a signatory to the agreement on January 28, 2013. The pact's framework is composed of 95 public policy proposals based on three guiding principles:
Document 7: State of Buenos Aires: The State of Buenos Aires ("Estado de Buenos Ayres") was a secessionist republic resulting from the overthrow of the Argentine Confederation government in the Province of Buenos Aires on September 11, 1852. The State of Buenos Aires was never recognized by the Confederation or by foreign nations; it remained, however, nominally independent under its own government and constitution. Buenos Aires rejoined the Argentine Confederation after the former's victory at the Battle of Pavón in 1861.
Document 8: Battle of Márquez Bridge: The Battle of Márquez Bridge (located on the border between current-day Villa Udaondo and Paso del Rey, Buenos Aires Province, Argentina), fought on 26 April 1829, during the civil war between Unitarians and Federalists, resulting in a victory for the Federal Party forces of Juan Manuel de Rosas and the governor of Santa Fe Province, Estanislao López, over general Juan Lavalle, who had usurped the office of Governor of Buenos Aires Province.
Document 9: Juan Manuel de Rosas (Buenos Aires Underground): Juan Manuel de Rosas is a terminus station on Line B of the Buenos Aires Underground. It is placed beneath Avenida Triunvirato, between Avenida Monroe and Avenida Franklin D. Roosevelt, in the Villa Urquiza barrio, and is an important transfer center with Villa Urquiza station on Ferrocarril General Bartolomé Mitre. It is named after Juan Manuel de Rosas, a politician, army officer and caudillo who ruled the Argentine Confederation almost uninterruptedly from 1829 until 1852.
Document 10: Prudencio Ortiz de Rozas: Prudencio Ortiz de Rozas (April 28, 1800-June 1, 1857) was an Argentine general, brother of governor Juan Manuel de Rosas. He fought at the Battle of Márquez Bridge and San José de Flores, and took part in the agreements of Rosas and Juan Lavalle in Cañuelas and Barracas. He took part in the battle of Chascomús, that defeated the Freemen of the South.
Document 11: San José palace: The San José Palace (in Spanish, Palacio San José) is the former personal residence of Justo José de Urquiza, Argentine "caudillo", general, politician and President of the Argentine Confederation from 1854 to 1860. The Palace is now the setting of the "Justo José de Urquiza Museum and National Monument".
Document 12: Decembrist revolution (Argentina): The Decembrist revolution (Spanish: "Revolución decembrina" ) was a military coup in the Buenos Aires Province, Argentina. Juan Lavalle, returning with the troops that fought in the Argentine-Brazilian War, made a coup on December 1, 1828, deposed the governor Manuel Dorrego and closed the legislature. Dorrego was captured and executed a short time afterwards. The rancher Juan Manuel de Rosas organized militias that fought against Lavalle and removed him from power, restoring the legislature. However, as the coup had reignited the Argentine Civil Wars, Rosas was appointed governor of the Buenos Aires province to wage the war against the Unitarian League. José María Paz made from Córdoba a league of provinces, and so did Rosas. The conflict ended a short time after the unexpected capture of Paz, who mistook enemy troops for his own.
Document 13: San José de Flores (Buenos Aires Underground): San José de Flores is a station on Line A of the Buenos Aires Underground. The station connects with Flores station on the Sarmiento Line commuter rail service.
Document 14: United Provinces of the Rio de la Plata: The United Provinces of the Río de la Plata (Spanish: "Provincias Unidas del Río de la Plata" ), earlier known as the United Provinces of South America (Spanish: "Provincias Unidas de Sudamérica" ), a union of provinces in the Río de la Plata region of South America, emerged from the May Revolution in 1810 and the Argentine War of Independence of 1810–1818. It comprised most of the former Viceroyalty of the Río de la Plata dependencies and had Buenos Aires as its capital.
Document 15: Treaty of Guadalupe Hidalgo: The Treaty of Guadalupe Hidalgo ("Tratado de Guadalupe Hidalgo" in Spanish), officially entitled the Treaty of Peace, Friendship, Limits and Settlement between the United States of America and the Mexican Republic, is the peace treaty signed on February 2, 1848, in the Villa de Guadalupe Hidalgo (now a neighborhood of Mexico City) between the United States and Mexico that ended the Mexican–American War (1846–48). The treaty came into force on July 4, 1848.
ground_truth: State of Buenos Aires