Here are more websites for information on the Mound Builders. Feel free to browse and get more information!
http://en.wikipedia.org/wiki/Mound_Builders
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http://history.howstuffworks.com/native-american-history/mound-builders.htm
http://publications.newberry.org/indiansofthemidwest/people-places-time/eras/moundbuilders/
http://www.wisegeek.com/who-were-the-mound-builders.htm
http://www.sacred-texts.com/atl/ssm/ssm11.htm
http://en.wikipedia.org/wiki/Mound_Builders
_
http://history.howstuffworks.com/native-american-history/mound-builders.htm
http://publications.newberry.org/indiansofthemidwest/people-places-time/eras/moundbuilders/
http://www.wisegeek.com/who-were-the-mound-builders.htm
http://www.sacred-texts.com/atl/ssm/ssm11.htm