United Provinces of the Río de la Plata in the context of "Constitution of Uruguay"

The Empire of Brazil (Portuguese: Império do Brasil) was a 19th-century state that broadly comprised the territories which form modern Brazil and Uruguay until the latter achieved independence in 1828. The empire's government was a representative parliamentary constitutional monarchy under the rule of Emperors Pedro I and his son Pedro II. A colony of the Kingdom of Portugal, Brazil became the seat of the Portuguese Empire in 1808, when the Portuguese Prince regent, later King Dom John VI, fled from Napoleon's invasion of Portugal and established himself and his government in the Brazilian city of Rio de Janeiro. John VI later returned to Portugal, leaving his eldest son and heir-apparent, Pedro, to rule the Kingdom of Brazil as regent. On 7 September 1822, Pedro declared the independence of Brazil and, after waging a successful war against his father's kingdom, was acclaimed on 12 October as Pedro I, the first Emperor of Brazil. The new country was huge, sparsely populated, and ethnically diverse.

Unlike most of the neighboring Hispanic American republics, Brazil had political stability, vibrant economic growth, constitutionally guaranteed freedom of speech, and respect for civil rights of its subjects, albeit with legal restrictions on women and slaves, the latter regarded as property and not citizens. The Empire's bicameral parliament was elected under comparatively democratic methods for the era, as were the provincial and local legislatures. This led to a long ideological conflict between Pedro I and a sizable parliamentary faction over the role of the monarch in the government. He also had to face other obstacles. The unsuccessful Cisplatine War against the neighboring United Provinces of the Río de la Plata in 1828 led to the secession of the province of Cisplatina (later to become Uruguay). In 1826, despite his role in Brazilian independence, he became the king of Portugal; he abdicated the Portuguese throne in favor of Maria, his eldest daughter. Two years later, she was usurped by Pedro I's younger brother Miguel. Unable to deal with both Brazilian and Portuguese affairs, Pedro I abdicated his Brazilian throne on 7 April 1831 and immediately departed for Europe to restore his daughter to the Portuguese throne.

Uruguay, officially the Oriental Republic of Uruguay, is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast, while bordering the Río de la Plata to the south and the Atlantic Ocean to the southeast. It is part of the Southern Cone region of South America. Uruguay covers an area of approximately 176,215 square kilometers (68,037 sq mi). It has a population of almost 3.5 million people, of whom nearly 2 million live in the metropolitan area of its capital and largest city, Montevideo.

The area that became Uruguay was first inhabited by groups of hunter gatherers 13,000 years ago. The first European explorer to reach the region was Juan Díaz de Solís in 1516, but the area was colonized later than its neighbors. At the time of European arrival, the Charrúa were the predominant tribe, alongside other groups such as the Guaraní and the Chaná. However, none of these groups were socially or politically organized, which contributed to their decline. Amid territorial disputes, the Portuguese established Colônia do Sacramento in 1680, and the Spanish founded Montevideo as a military stronghold. Uruguay secured its independence between 1811 and 1828, following a four-way struggle involving Portugal, Spain, and later the United Provinces of the Río de la Plata and the Empire of Brazil. In 1830, the country enacted its constitution and was formally established as an independent state.

The Cisplatine War was an armed conflict fought in the 1820s between the Empire of Brazil and the United Provinces of the Río de la Plata over control of the Banda Oriental following its annexation by Brazil as the Cisplatina province. It was fought in the aftermath of the United Provinces' and Brazil's independence from Spain and Portugal, respectively, and resulted in the independence of Cisplatina as the Oriental Republic of Uruguay.

In 1816, the United Kingdom of Portugal, Brazil and the Algarves carried out an invasion of the Banda Oriental and, after defeating the local resistance led by José Gervasio Artigas, annexed it under the name of Cisplatina. After Brazil's independence in 1822, Cisplatina remained as part of Brazil. Wishing to gain control of the region, the United Provinces sent a diplomatic mission to Brazil in 1823 to negotiate a peaceful Brazilian withdrawal, but it failed. In 1825, a group of patriots known as the Thirty-Three Orientals, supported by the Argentine government and led by Juan Antonio Lavalleja, launched a rebellion against Brazil. On 25 August of that year, in the Congress of Florida, they declared Cisplatina's independence from Brazil and its unification with the United Provinces. After a series of initial skirmishes, they defeated the Brazilians at the battles of Rincón and Sarandí, prompting the Argentine Congress to proclaim Cisplatina reintegrated into the United Provinces on 25 October. In response, Brazil declared war on the United Provinces on 10 December 1825 and imposed a naval blockade on the River Plate.

The First Republic of New Granada, known derogatorily as the Foolish Fatherland (Spanish: la Patria Boba), is the period in the history of Colombia immediately following the declaration of independence from Spain in 1810 as the first South American independent nation to break away from Spanish rule until the Spanish reconquest in 1816. The period between 1810 and 1816 in the Viceroyalty of New Granada (which included present-day Colombia) was marked by such intense conflicts over the nature of the new government or governments that it became known as la Patria Boba (the Foolish Fatherland). Constant fighting between federalists and centralists gave rise to a prolonged period of instability that eventually favored Spanish reconquest. Similar developments can be seen at the same time in the United Provinces of the Río de la Plata. Each province, and even some cities, set up its own autonomous junta, which declared themselves sovereign from each other.

Bernardo O'Higgins Riquelme (Spanish pronunciation: [beɾˈnaɾðo oˈ(x)iɣins] ; 20 August 1778 – 24 October 1842) was a Chilean independence leader who freed Chile from Spanish rule in the Chilean War of Independence. He was a wealthy landowner of Basque-Spanish and Irish ancestry. Although he was the second Supreme Director of Chile (1817–1823), he is considered one of Chile's founding fathers, as he was the first holder of this title to head a fully independent Chilean state.

He was Captain General of the Chilean Army, Brigadier of the United Provinces of the Río de la Plata, General Officer of Gran Colombia, and Grand Marshal of Peru.

The Battle of Chacabuco, fought during the Chilean War of Independence, took place on February 12, 1817. The Army of the Andes, from the United Provinces of the Río de la Plata and led by Captain–General José de San Martín, defeated a Spanish force commanded by Rafael Maroto. This victory was a significant defeat for the Captaincy General of Chile, the royalist government established after the division of the Viceroyalty of Peru.

José Gervasio Artigas Arnal (Spanish pronunciation: [xoˈse xeɾˈβa.sjo aɾˈti.ɣas aɾˈnal]; June 19, 1764 – September 23, 1850) was a soldier and statesman who is regarded as a national hero in Uruguay and the father of Uruguayan nationhood.

Born in Montevideo, Artigas enlisted in the Spanish military in 1797 and fought the British in the Anglo-Spanish War. At the outbreak of the Spanish-American wars of independence, Artigas supported the Primera Junta in Buenos Aires against Spain. He defeated the Spanish royalists at Las Piedras and laid siege to Montevideo, but was forced to withdraw in the face of Portuguese intervention. Artigas subsequently broke with the centralist government of Buenos Aires and took over Montevideo in 1815. He then oversaw the creation of the Federal League, an alliance of six provinces under a federal style of government.