culture 2014- Brazil

http://www.mongabay.com/history/brazil/brazil-the_brazilian_way.html

Look at perhaps a 'Brazilian culture'

http://www.brazilrus.com/culture-and-people/

overview of Brazilian regional differences

http://countrystudies.us/brazil/35.htm
basics of the Amerindian population

http://www.survivalinternational.org/tribes/uncontacted-brazil
info on some of the most isolated- and what threatens their survival and therefore their diversity