The correct answer to this open question is the following.
In South America, the Incas were the most prominent culture of this part of the continent. They inhabited the territories of what today is Peru. They were great engineers and built the impressive city of Machu Pichu, at the top of the Andes Mountains.
In the region of Mesoamerica, the Aztecs were an important culture that lived in the Tenochtitlan, in what today is downtown Mexico City. They were fierce warriors that conquered many surrounding territories and tribes such as the Chollulans and Tlaxcanteans.
The Mayas lived in the South part of Mexico in the Yucatan Peninsula and some parts of Belize and Guatemala. They were great astronomers and were the creators of the famous Mayan Calendar.
