paragraph_text: Little River State Beach is a protected beach of California, United States, in Humboldt County. It is located at the mouth of the Little River, north of Eureka right off U.S. Route 101. The park was established in 1931.

paragraph_text: The Paraguay River (Río Paraguay in Spanish, Rio Paraguai in Portuguese, Ysyry Paraguái in Guarani) is a major river in south-central South America, running through Brazil, Bolivia, Paraguay and Argentina. It flows about from its headwaters in the Brazilian state of Mato Grosso to its confluence with the Paraná River north of Corrientes and Resistencia.

paragraph_text: The São Lourenço River is a tributary of the Paraguay River within the Pantanal, an alluvial plain that spans portions of Brazil, Bolivia and Paraguay.

paragraph_text: The Libby River is a river in the town of Scarborough, Maine, in the United States. It is tidal in its lower reaches, and it is a tributary of the Scarborough River, joining it just above that river's mouth at the Atlantic Ocean.

paragraph_text: Wassaw Sound is a bay of the Atlantic Ocean on the coast of Georgia, United States near Savannah at the mouth of the Wilmington River.

paragraph_text: Paddys River, a watercourse of the Murray catchment within the Murray–Darling basin, is located in the Australian Alpine region of New South Wales, Australia.

paragraph_text: Barcoongere River, a watercourse of the Wooli Wooli River catchment, is located in the Northern Rivers region of New South Wales, Australia.

paragraph_text: Mummel River, a watercourse of the Manning River catchment, is located in the Northern Tablelands and Mid North Coast districts of New South Wales, Australia.

paragraph_text: Mehi River, a watercourse that is part of the Barwon catchment within the Murray–Darling basin, is located in the Orana district of New South Wales, Australia.

paragraph_text: The Mokihinui River's headwaters are located in the Glasgow Range and its mouth is on the Tasman Sea. There is little human habitation near the river: the localities of Mokihinui and Summerlea are near the river's mouth, Seddonville is a few kilometres up the river, and just prior to its terminus, State Highway 67 crosses the river outside Mokihinui. In the rugged back country behind Seddonville at the Mokihinui Forks, the river splits into two branches, north and south. The catchment of these two branches is a large inland basin of almost wholly unmodified forest.

paragraph_text: Splitrock is an abandoned townsite in Beaver Bay Township, Lake County, Minnesota, United States; located at the mouth of the Split Rock River.

paragraph_text: The Igaraçu River, also called the Igarassu River, is a distributary of the Parnaíba River in northern Piauí state in Brazil. It flows from its origin on the Parnaiba River southwest of the city of Parnaíba to the mouth on the Atlantic Ocean near the city of Luís Correia.

paragraph_text: Canyon Island is an island in the City and Borough of Juneau, Alaska, United States. Located in the Taku River, it is northeast of the mouth of the Wright River and northeast of the city of Juneau. The name was first reported by the United States Geological Survey in 1960, collected between 1976 and 1981, and entered into the Geographic Names Information System on March 31, 1981.

paragraph_text: Vicente Nicolau de Mesquita (July 9, 1818 in São Lourenço, Portuguese Macau – March 20, 1880 in São Lourenço, Portuguese Macau) was an officer of the Portuguese Army in Macau. He is widely remembered for his role at the Portuguese attack of Baishaling, in 1849. He was the oldest of the five children of noted Macanese lawyer, Frederico Albino de Mesquita and Clara Esmeralda Carneiro - both Macau natives. He married twice; first to Balbina Maria da Silveira; second to his sister-in-law Carolina Maria Josefa da Silveira.

paragraph_text: The São Mateus River (Santa Catarina) is a river of Santa Catarina state in southeastern Brazil. It is part of the Uruguay River basin and a tributary of the Lava-Tudo River.

paragraph_text: Morgan Point Lighthouse is a lighthouse in Noank, Connecticut, United States, on the west side of the mouth of the Mystic River.

paragraph_text: By the late 1950s, when other emerging nations across the African Continent were demanding independence, a small group of São Toméans had formed the Movement for the Liberation of São Tomé and Príncipe (MLSTP), which eventually established its base in nearby Gabon. Picking up momentum in the 1960s, events moved quickly after the overthrow of the Caetano dictatorship in Portugal in April 1974. The new Portuguese regime was committed to the dissolution of its overseas colonies; in November 1974, their representatives met with the MLSTP in Algiers and worked out an agreement for the transfer of sovereignty. After a period of transitional government, São Tomé and Príncipe achieved independence on July 12, 1975, choosing as its first president the MLSTP Secretary General Manuel Pinto da Costa.

paragraph_text: Maria River, a watercourse of the Hastings River catchment, is located in the Mid North Coast region of New South Wales, Australia.

paragraph_text: The Spanish colonies won their independence in the first quarter of the 19th century, in the Spanish American wars of independence. Simón Bolívar (Greater Colombia, Peru, Bolivia), José de San Martín (United Provinces of the River Plate, Chile, and Peru), and Bernardo O'Higgins (Chile) led their independence struggle. Although Bolivar attempted to keep the Spanish - speaking parts of the continent politically unified, they rapidly became independent of one another.

paragraph_text: The Abaeté River is a river of Minas Gerais state in southeastern Brazil. Its origin is in the Serra da Canastra, about north of São Gotardo and it passes through São Gonçalo do Abaeté. The river runs nearly north and empties into the São Francisco River, the confluence being located at . The Pontal area at the Abaeté River mouth is an important spawning site for fish.

Question: When did the continent on which the mouth of the São Lourenço River can be found become a collection of independent states?
Answer: the first quarter of the 19th century