Viceroyalty of the Río de la Plata in the context of "Buenos Aires"

The Viceroyalty of Peru (Spanish: Virreinato del Perú), officially known as the Kingdom of Peru (Spanish: Reino del Perú), was a Spanish imperial provincial administrative district, created in 1542, that originally contained modern-day Peru and most of the Spanish Empire in South America, governed from the capital of Lima. Along with the Viceroyalty of New Spain, Peru was one of two Spanish viceroyalties in the Americas from the sixteenth to the eighteenth centuries.

The Spanish did not resist the Portuguese expansion of Brazil across the meridian established by the Treaty of Tordesillas. The treaty was rendered meaningless between 1580 and 1640 while Spain controlled Portugal. The creation during the 18th century of the Viceroyalties of New Granada and Río de la Plata (at the expense of Peru's territory) reduced the importance of Lima and shifted the lucrative Andean trade to Buenos Aires, while the fall of the mining and textile production accelerated the progressive decay of the Viceroyalty of Peru.

Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of 2,780,085 km (1,073,397 sq mi), making it the second-largest country in South America after Brazil, the fourth-largest country in the Americas, and the eighth-largest country in the world. Argentina shares the bulk of the Southern Cone with Chile to the west, and is also bordered by Bolivia and Paraguay to the north, Brazil to the northeast, Uruguay and the South Atlantic Ocean to the east, and the Drake Passage to the south. Argentina is a federal state subdivided into twenty-three provinces, and one autonomous city, which is the federal capital and largest city of the nation, Buenos Aires. The provinces and the capital have their own constitutions, but exist under a federal system. Argentina claims sovereignty over the Falkland Islands, South Georgia and the South Sandwich Islands, the Southern Patagonian Ice Field, and a part of Antarctica.

The earliest recorded human presence in modern-day Argentina dates back to the Paleolithic period. The Inca Empire expanded to the northwest of the country in pre-Columbian times. The modern country has its roots in Spanish colonisation of the region during the 16th century. Argentina rose as the successor state of the Viceroyalty of the Río de la Plata, a Spanish overseas viceroyalty founded in 1776. The Argentine Declaration of Independence on July 9 of 1816 and the Argentine War of Independence (1810–1825) were followed by an extended civil war that lasted until 1880, culminating in the country's reorganisation as a federation. The country thereafter enjoyed relative peace and stability, with several subsequent waves of European immigration, mainly of Italians and Spaniards, influencing its culture and demography.

Spanish America refers to the Spanish territories in the Americas during the Spanish colonization of the Americas. The term "Spanish America" was specifically used during the territories' imperial era between 15th and 19th centuries. To the end of its imperial rule, Spain called its overseas possessions in the Americas and the Philippines "The Indies", an enduring remnant of Columbus's notion that he had reached Asia by sailing west. When these territories reach a high level of importance, the crown established the Council of the Indies in 1524, following the conquest of the Aztec Empire, asserting permanent royal control over its possessions. Regions with dense indigenous populations and sources of mineral wealth attracting Spanish settlers became colonial centers, while those without such resources were peripheral to crown interest. Once regions incorporated into the empire and their importance assessed, overseas possessions came under stronger or weaker crown control.

The crown learned its lesson with the rule of Christopher Columbus and his heirs in the Caribbean, and they never subsequently gave authorization of sweeping powers to explorers and conquerors. The Catholic Monarchs' conquest of Granada in 1492 and their expulsion of the Jews "were militant expressions of religious statehood at the moment of the beginning of the American colonization." The crown's power in the religious sphere was absolute in its overseas possessions through the papacy's grant of the Patronato real, and "Catholicism was indissolubly linked with royal authority." Church-State relations were established in the conquest era and remained stable until the end of the Habsburg era in 1700, when the Bourbon monarchs implemented major reforms and changed the relationship between crown and altar.

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), was a name adopted in 1816 by the Congress of Tucumán for the region of South America that declared independence in 1816, with the Sovereign Congress taking place in 1813, during the Argentine War of Independence (1810–1818) that began with the May Revolution in May of 1810. It originally comprised rebellious territories of the former Spanish Viceroyalty of the Río de la Plata dependencies and had Buenos Aires as its capital.

The name Provincias del Río de la Plata (formally adopted during the Cortes of Cádiz to designate the Viceroyalty of the Río de la Plata) alludes to the Junta Provisional Gubernativa de las Provincias del Río de la Plata or Primera Junta. It is best known in Argentinean literature as Provincias Unidas del Río de la Plata ('United Provinces of the River Plate' i.e. 'river of silver'), this being the most common name (since 1811) in use for the country until the enactment of the 1826 Constitution. The Argentine National Anthem refers to the state as "the United Provinces of the South". The Constitution of Argentina recognises Provincias Unidas del Río de la Plata as one of the official names of the country, referred to as "Argentine Nation" (Nación Argentina) in modern legislation.

A cabildo (Spanish pronunciation: [kaˈβildo]) or ayuntamiento (Spanish: [aʝuntaˈmjento]) was a Spanish colonial and early postcolonial administrative council that governed a municipality. Cabildos were sometimes appointed, sometimes elected, but were considered to be representative of all land-owning heads of household (vecinos). The colonial cabildo was essentially the same as the one that was developed in medieval Castile.

The word cabildo has the same Latin root (capitulum) as the English word chapter and in fact is also the Spanish word for a cathedral chapter. Historically, the term ayuntamiento was often preceded by the word excelentísimo (English: "most excellent") as a style of office in referring to the council. That phrase is often abbreviated Exc. Ay.

The Argentine Civil Wars (Spanish: Guerras civiles argentinas) were a series of civil conflicts of varying intensity that took place in the territories of Argentina from 1814 to 1853. Beginning concurrently with the Argentine War of Independence (1810–1818), the conflict prevented the formation of a stable governing body until the signing of the Argentine Constitution of 1853, followed by low-frequency skirmishes that ended with the Federalization of Buenos Aires in 1880.

The period saw heavy intervention from the Brazilian Empire, which fought against the state and provinces in multiple wars. Breakaway nations, former territories of the Viceroyalty, such as the Banda Oriental, Paraguay and Upper Peru, were involved to varying degrees. Foreign powers such as the British and French empires put heavy pressure on the fledgling nations during international war.

Captain-General Rafael del Riego y Flórez (7 April 1784 – 7 November 1823) was a Spanish Army officer and politician who played a key role in the establishment of the Liberal Triennium (Trienio liberal in Spanish). The failure of the Cádiz army to set sail has been identified as the most important factor in the loss of Spanish control over the Río de la Plata.

The British invasions of the River Plate were two unsuccessful British attempts to seize control of the Spanish colony of the Viceroyalty of the Río de la Plata, located around the Río de la Plata in South America – in present-day Argentina and Uruguay. The invasions took place between 1806 and 1807, as part of the Napoleonic Wars, War of the Third Coalition at a time when Spain was an ally of Napoleonic France. In Argentine historiography, the two successive defeats of the British expeditionary forces are known collectively as the Reconquista and the Defensa, respectively.