In 1890, blacks were estimated to make up 56 percent of Brazil's population, but that number dropped to 36 percent in 1940, according to the study  Whites outbreeding blacks? Thats not possible, look at Africa, they manage to expand their population despite recurring mass starvations, galloping AIDS, general negritude and machete partys. I suspect corrupt statistics. It's probably because a ton of Europeans immigrated to Brazil and the rest of South America in the first half of the 20th century.