For Information on Cahokian Civilization, read the following passage above, read pg. 443 to 444 in Chapter 16 called "Mound Builders and Other Woodland Civilizations" and if you would like to read some more, you can read the article in the link below. This article is written for adults who are fluent in English.

http://www.washingtonpost.com/wp-srv/national/daily/march/12/cahokia.htm