The Kayapo are a indigenous tribe that have been around forever but in 1889 that changed with the formation of the Brazilian Republic.In 1900 the population was about 4000 but went down to 1300 in the late 1970s.In the 1980s and 1990s some Kayapo village chiefs made partnerships with some mining companies. This is just some of the history from the Kayapo out of quite a bit of it.