Rio de Janeiro, or simply Rio, is anchor to the Rio de Janeiro metropolitan area and the second-most populous municipality in Brazil and the sixth-most populous in the Americas. Rio de Janeiro is the capital of the state of Rio de Janeiro, Brazil's third-most populous state, after São Paulo and Minas Gerais. Part of the city has been designated as a World Heritage Site, named "Rio de Janeiro: Carioca Landscapes between the Mountain and the Sea", by UNESCO on 1 July 2012 as a Cultural Landscape.

History

Colonial period

Europeans first encountered  Guanabara Bay on 1 January 1502 (hence Rio de Janeiro, "January River"), by a Portuguese expedition under explorer Gaspar de Lemos, captain of a ship in Pedro Álvares Cabral's fleet, or under Gonçalo Coelho. Allegedly the Florentine explorer Amerigo Vespucci participated as observer at the invitation of King Manuel I in the same expedition. The region of Rio was inhabited by the Tupi, Puri, Botocudo and Maxakalí peoples.

In 1555, one of the islands of Guanabara Bay, now called Villegagnon Island, was occupied by 500 French colonists under the French admiral Nicolas Durand de Villegaignon. Consequently, Villegagnon built Fort Coligny on the island when attempting to establish the France Antarctique colony.

The city of Rio de Janeiro proper was founded by the Portuguese on 1 March 1565 and was named São Sebastião do Rio de Janeiro, in honour of St. Sebastian, the saint who was the namesake and patron of the Portuguese then-monarch Sebastião. Rio de Janeiro was the name of Guanabara Bay. Until early in the 18th century, the city was threatened or invaded by several mostly French pirates and buccaneers, such as Jean-François Duclerc and René Duguay-Trouin.

In the late 17th century, still during the Sugar Era, the Bandeirantes discovered gold and diamonds in the neighbouring captaincy of Minas Gerais, thus Rio de Janeiro became a much more practical port for exporting wealth (gold, precious stones, besides the sugar) than Salvador, Bahia, much farther northeast. On 27 January 1763, the colonial administration in Portuguese America was moved from Salvador to Rio de Janeiro. The city remained primarily a colonial capital until 1808, when the Portuguese royal family and most of the associated Lisbon nobles, fleeing from Napoleon's invasion of Portugal, moved to Rio de Janeiro.

Portuguese court and imperial capital

The kingdom's capital was transferred to the city, which, thus, became the only European capital outside of Europe. As there was no physical space or urban structure to accommodate hundreds of noblemen who arrived suddenly, many inhabitants were simply evicted from their homes. In the first decade, several educational establishments were created, such as the Military Academy, the Royal School of Sciences, Arts and Crafts and the Imperial Academy of Fine Arts, as well as the National Library of Brazil – with the largest collection in Latin America – and The Botanical Garden. The first printed newspaper in Brazil, the Gazeta do Rio de Janeiro, came into circulation during this period. When Brazil was elevated to Kingdom in 1815, it became the capital of the United Kingdom of Portugal, Brazil and the Algarves until the return of the Portuguese Royal Family to Lisbon in 1821, but remained as capital of the Kingdom of Brazil.

From the colonial period until the first independent era, Rio de Janeiro was a city of slaves. There was a large influx of African slaves to Rio de Janeiro: in 1819, there were 145,000 slaves in the captaincy. In 1840, the number of slaves reached 220,000 people. The Port of Rio de Janeiro was the largest port of slaves in America.

When Prince Pedro proclaimed the independence of Brazil in 1822, he decided to keep Rio de Janeiro as the capital of his new empire while the place was enriched with sugar cane agriculture in the Campos region and, especially, with the new coffee cultivation in the Paraíba Valley. In order to separate the province from the capital of the Empire, the city was converted, in the year of 1834, in Neutral Municipality, passing the province of Rio de Janeiro to have Niterói as capital.

As a political centre of the country, Rio concentrated the political-partisan life of the Empire. It was the main stage of the abolitionist and republican movements in the last half of the 19th century. At that time the number of slaves was drastically reduced and the city was developed, with modern drains, animal trams, train stations crossing the city, gas and electric lighting, telephone and telegraph wiring, water and river plumbing. Rio continued as the capital of Brazil after 1889, when the monarchy was replaced by a republic.

On 6 February 1889 the Bangu Textile Factory was founded, with the name of Industrial Progress Company of Brazil (Companhia Progresso Industrial do Brasil). The factory was officially opened on 8 March 1893, in a complex with varying architectural styles like Italianate, Neo-Gothic and a tower in Mansard Roof style. After the opening in 1893, workers from Great Britain arrived in Bangu to work in the textile factory. The old farms became worker villages with red bricks houses, and a neo-gothic church was created, which still exists as the Saint Sebastian and Saint Cecilia Parish Church. Street cinemas and cultural buildings also appeared. In May 1894, Thomas Donohoe, a British worker from Busby, Scotland, arrived in Bangu.

Donohoe was horrified to discover that there was absolutely no knowledge of football among Brazilians. So he wrote to his wife, Elizabeth, asking her to bring a football when she joined him. And shortly after her arrival, in September 1894, the first football match in Brazil took place in the field beside the textile factory. It was a five-a-side match between British workers, and took place six months before the first game organized by Charles Miller in São Paulo. However, the Bangu Football Club was not formally created until 1904.

Republican period

At the time Brazil's Old Republic was established, the city lacked urban planning and sanitation, which helped spread several diseases, such as yellow fever, dysentery, variola, tuberculosis and even black death. Pereira Passos, who was named mayor in 1902, imposed reforms to modernize the city, demolishing the cortiços where most of the poor population lived. These people, mostly descendants of slaves, then moved to live in the city's hills, creating the first favelas. Inspired by the city of Paris, Passos built the Municipal Theatre, the National Museum of Fine Arts and the National Library in the city's center; brought electric power to Rio and created larger avenues to adapt the city to automobiles. Passos also named Dr. Oswaldo Cruz as Director General of Public Health. Cruz's plans to clean the city of diseases included compulsory vaccination of the entire population and forced entry into houses to kill mosquitos and rats. The people of city rebelled against Cruz's policy, in what would be known as the Vaccine Revolt.

In 1910, Rio saw the Revolt of the Lash, where Afro-Brazilian crew members in the Brazilian Navy mutinied against the heavy use of corporal punishment, which was similar to the punishment slaves received. The mutineers took control of the battleship Minas Geraes and threatened to fire on the city. Another military revolt occurred in 1922, the 18 of the Copacabana Fort revolt, a march against the Old Republic's coronelism and café com leite politics. This revolt marked the beginning of Tenentism, a movement that resulted in the Brazilian Revolution of 1930 that started the Vargas Era.

Until the early years of the 20th century, the city was largely limited to the neighbourhood now known as the historic city centre (see below), on the mouth of Guanabara Bay. The city's centre of gravity began to shift south and west to the so-called Zona Sul (South Zone) in the early part of the 20th century, when the first tunnel was built under the mountains between Botafogo and the neighbourhood that is now known as Copacabana. Expansion of the city to the north and south was facilitated by the consolidation and electrification of Rio's streetcar transit system after 1905. Botafogo's natural environment, combined with the fame of the Copacabana Palace Hotel, the luxury hotel of the Americas in the 1930s, helped Rio to gain the reputation it still holds today as a beach party town. This reputation has been somewhat tarnished in recent years by favela violence resulting from the narcotics trade and militias.

Plans for moving the nation's capital city from Rio de Janeiro to the centre of Brazil had been occasionally discussed, and when Juscelino Kubitschek was elected president in 1955, it was partially on the strength of promises to build a new capital. Though many thought that it was just campaign rhetoric, Kubitschek managed to have Brasília and a new Federal District built, at great cost, by 1960. On 21 April of that year, the capital of Brazil was officially moved to Brasília. The territory of the former Federal District became its own state, Guanabara, after the bay that borders it to the east, encompassing just the city of Rio de Janeiro. After the 1964 coup d'état that installed a military dictatorship, the city-state was the only state left in Brazil to oppose the military. Then, in 1975, a presidential decree known as "The Fusion" removed the city's federative status and merged it with the State of Rio de Janeiro, with the city of Rio de Janeiro replacing Niterói as the state's capital, and establishing the Rio de Janeiro Metropolitan Region.

In 1992, Rio hosted the Earth Summit, a United Nations conference to fight environmental degradation. Twenty years later, in 2012, the city hosted another conference on sustainable development, named United Nations Conference on Sustainable Development. The city hosted the World Youth Day in 2013, the second World Youth Day in South America and first in Brazil. In the sports field, Rio de Janeiro was the host of the 2007 Pan American Games and the 2014 FIFA World Cup Final. On 2 October 2009, the International Olympic Committee announced that Rio de Janeiro would host the 2016 Olympic Games and the 2016 Paralympic Games, beating competitors Chicago, Tokyo, and Madrid. The city became the first South American city to host the event and the second Latin American city (after Mexico City in 1968) to host the Games.