Tupi-Sprache
Although the Tupi population largely disappeared because of European diseases to which they had no resistance or because of slavery, a large population of maternal Tupi ancestry occupied much of Brazilian territory, taking the ancient traditions to several points of the country. Darcy Ribeiro wrote that the features of the first Brazilians were much more Tupi than Portuguese, and even the language that they spoke was a Tupi-based language, named Nheengatu or Língua Geral, a lingua franca in Brazil until the 18th century. The region of São Paulo was the biggest in the proliferation of Mamelucos, who in the 17th century under the name of Bandeirantes, spread throughout the Brazilian territory, from the Amazon rainforest to the extreme South. They were responsible for the major expansion of the Iberian culture in the interior of Brazil. They acculturated the Indian tribes who lived in isolation, and took the language of the colonizer, which was not Portuguese yet, but Nheengatu itself, to the most inhospitable corners of the colony. Nheengatu is still spoken in certain regions of the Amazon, although the Tupi-speaking Indians did not live there. The Nheengatu language, as in other regions of the country, was introduced there by Bandeirantes from São Paulo in the 17th century. The way of life of the "Old" "Paulistas" could almost be confused with the Indians. Within the family, only Nheengatu was spoken. Agriculture, hunting, fishing and gathering of fruits were also based on Indian traditions. What differentiated the "Old Paulistas" from the Tupi was the use of clothes, salt, metal tools, weapons and other European items.