The Incas

http://incas.mrdonn.org/index.html

http://www.history.com/topics/machu-picchu

The Mexica (ma she ka) incorrectly known as the Aztecs

http://aztecs.mrdonn.org/index.html

http://www.history.com/topics/aztecs

The Mayas

http://mayas.mrdonn.org/index.html

http://www.history.com/topics/maya

A LINK FOR ALL THREE CULTURES

http://www.kidinfo.com/american_history/ancient_americas_culture.htm