The answer is Native American. However, if we are talking about Native
Americans in South America there were various tribes who were now living there.
You have the Mayas and the Aztecs living in Mexico and the Incas of Peru. These people had their own civilization and
had to farm as well as to build large structures which gave them a high level
of intelligence. Further proof that of
intelligence was they had their own calendar and knew mathematics as well as
astronomy.