This article is largely based on the claims of Bartolome de Las Casas, an activist from the time of Conquistadors. Some scholars believe thathe wildly exaggerated the crimes in order to convince the Spanish and other governments to intervene.
But that does not imply that there was not an extermination. [1]
[1] A single and not isolated example. -> http://en.wikipedia.org/wiki/Tupi_people#European_colonizati...
The racial traits are different from african to american natives. It's clear the difference between Brazil or Cuba (where most slaves were brought) and Mexico. And remember I'm writting of average,
About the word "extermination" it seems you're using it to describe killing of many individuals. I would keep it to refer to something like killing 99.99 indigenous population.
Extermination didn't take place, but rape did?