Brazilian censuses do not use a "multiracial" category. Instead, the censuses use skin colour categories. Most Brazilians of visibly mixed racial origins self-identify as pardos. However, many White Brazilians have distant non-white ancestry, while the group known as pardos likely contains acculturated Amerindians. According to the 2010 census, "pardos" make up 82.277 million people or 43.13% of Brazil's population.
According to some DNA researches, Brazilians predominantly possess some degree of mixed-race ancestry, though less than half of the country's population classified themselves as "pardos" in the census. This is not seen as any kind of misclassification, since the census categories are not and do not intend to be, based on ancestry, but rather on skin colour.
History
Before the arrival of the Portuguese in 1500, Brazil was inhabited by nearly five million Amerindians. The Portuguese colonization of Brazil started in the sixteenth century. In the first two centuries of colonization, 100,000 Portuguese arrived in Brazil (around 500 colonists per year). In the eighteenth century, 600,000 Portuguese arrived (6,000 per year). Another race, Blacks, were brought from Africa as slaves, starting around 1550. Many came from Guinea or from West African countries - by the end of the eighteenth century many had been taken from Congo, Angola and Mozambique (or, in Bahia, from Benin). By the time of the end of the slave trade in 1850, around 3.5 million slaves had been brought to Brazil–37% of all slave traffic between Africa and the Americas.
In the late nineteenth and early twentieth centuries, a considerable influx of mainly European immigrants arrived in Brazil. According to the Memorial do Imigrante, Brazil attracted nearly 5 million immigrants between 1870 and 1953. Most of the immigrants were from Italy or Portugal, but also significant numbers of Germans, Spaniards, Japanese and Syrian-Lebanese.
The Portuguese settlers were the ones to start the intensive race-mixing process in Brazil. Miscegenation in Brazil, according to many historians, was not a pacific process as some used to believe: it was a domination form found from the Portuguese against the Native Brazilian and African populations.
The White Portuguese population in Brazil never outnumbered the non-White one. The numbers of Indigenous peoples and African slaves were much higher during Colonial Brazil. However, in the 19th century, there were more Brazilians of mixed Portuguese descent than those of pure African or Indian descent.
White/Amerindian
Most of the first colonists from Portugal who arrived in Brazil were singles or did not bring their wives. For that reason the first interracial marriages in Brazil occurred between Portuguese males and Amerindian females.
In Brazil, people of White/Indian ancestry are historically known as caboclos or mamelucos. They predominated in many regions of Brazil. One example are the Bandeirantes (Brazilian colonial scouts who took part in the Bandeiras, exploration expeditions) who operated out of São Paulo, home base for the most famous bandeirantes.
Indians, mostly free men and mamelucos, predominated in the society of São Paulo in the 16th and early 17th centuries and outnumbered Europeans. The influential families generally bore some Indian blood and provided most of the leaders of the bandeiras, with a few notable exceptions such as Antonio Raposo Tavares (1598–1658), who was European-born.
White/Black
According to some historians, Portuguese settlers in Brazil used to prefer to marry Portuguese-born females. If not possible, the second option were Brazilian-born females of recent Portuguese background. The third option were Brazilian-born women of distant Portuguese ancestry. However, the number of White females in Brazil was very low during the Colonial period, causing a large number of interracial relationships in the country.
White/Black relationships in Brazil started as early as the first Africans were brought as slaves in 1550 where many portuguese men starting marrying black women. The Mulattoes (people of White/Black ancestry) were also enslaved, though some children of rich aristocrats and owners of gold mines were educated and became important people in Colonial Brazil. Probably, the most famous case was Chica da Silva, a mixed-race Brazilian slave who married a rich gold mine owner and became one of the richest people in Brazil.
Other mulattoes largely contributed to Brazil's culture: Aleijadinho (sculptor and architect), Machado de Assis (writer), Lima Barreto (writer), Chiquinha Gonzaga (composer), etc.