Steven Pinker's book The Blank Slate argues that all humans are born with some innate traits. Here, Pinker talks about his thesis, and why some people found it incredibly upsetting.

For this reason, several generations of the black population have been forced to fight to this day in order to conserve the language they brought with them, and with it all of their accumulated history, wisdom, and identity. They struggle against the rejection of the mestizo majority as well as the governments in office, who have for years denied them Costa Rican nationality, despite being born in the country.