Brazil received ten times more slaves than the US. This is their story, told in 2000 by the BBC, in the documentary “Brazil Inconvenient Story”. It displays all sorts of original documents, plus interviews with historians João José Reis, Cya Teixeira, Marilene Rosa da Silva, and anthropologist Peter Fry.
You might also want to follow the PBS channel documentary Black in Latin America, narrated by Henry Louis Gates Jr., a Harvard University professor. On the documentary website, check also for the timeline of Brazil’s history as a ‘rainbow nation.’