I was listening to an episode of Behind the Bastards about the slave labor used by Volkswagen in the 1970s and 1980s and this fact came up. Here’s the relevant Wiki:
https://en.wikipedia.org/wiki/Slavery_in_Brazil
Excerpt:
Out of the 12 million Africans who were forcibly brought to the New World, approximately 5.5 million were brought to Brazil between 1540 and the 1860s.
Let’s also not forget many countries that today don’t have a visible black population were also very active in slavery.
https://en.wikipedia.org/wiki/Afro-Argentines https://en.wikipedia.org/wiki/Afro-Uruguayans https://en.wikipedia.org/wiki/Afro-Chileans