List of pre-Columbian inventions and innovations of Indigenous Americans

This is an alphabetic list of Pre-columbian achievements in science and technology made by the Indigenous peoples of the Americas during the 15,000 years that they have inhabited the Americas. == A == Abacus – The Aztec and Maya of Mesoamerica performed arithmetic operations using an abacus.

Source: Wikipedia — List of pre-Columbian inventions and innovations of Indigenous Americans (CC BY-SA 4.0)