Some old mounds reflecting Indian settlements in the territory which is now the United States of America have been discovered, such as the Adena burial mounds and Mississippian platform towns.<ref>Melissa L. Meyer, Dean R. Snow, Charles L. Cohen, Russell Thornton, Donald A. Grinde Jr., Leah Dilworth "Indian History and Culture" The Oxford Companion to United States History. Paul S. Boyer, ed. Oxford University Press 2001. Oxford Reference Online. Oxford University Press. University of Tampa. 4 August 2008 <http://www.oxfordreference.com/views/ENTRY.html?subview=Main&entry=t119.e0758-s0002></ref> The [[Cahokia Mounds]] in Southern Illinois (just east of [[St. Louis]]) reflect an Indian community dating back as early as A.D. 1000 or 1100.<ref>http://www.cahokiamounds.com/mystery_01.html</ref> That community practiced human sacrifice, as did the [[Aztecs]] and [[Mayans]] in [[Mesoamerica]] (Mexico and Central America) and the [[Incas]] in [[South America]] prior to the arrival of the Spanish conquerors. | Some old mounds reflecting Indian settlements in the territory which is now the United States of America have been discovered, such as the Adena burial mounds and Mississippian platform towns.<ref>Melissa L. Meyer, Dean R. Snow, Charles L. Cohen, Russell Thornton, Donald A. Grinde Jr., Leah Dilworth "Indian History and Culture" The Oxford Companion to United States History. Paul S. Boyer, ed. Oxford University Press 2001. Oxford Reference Online. Oxford University Press. University of Tampa. 4 August 2008 <http://www.oxfordreference.com/views/ENTRY.html?subview=Main&entry=t119.e0758-s0002></ref> The [[Cahokia Mounds]] in Southern Illinois (just east of [[St. Louis]]) reflect an Indian community dating back as early as A.D. 1000 or 1100.<ref>http://www.cahokiamounds.com/mystery_01.html</ref> That community practiced human sacrifice, as did the [[Aztecs]] and [[Mayans]] in [[Mesoamerica]] (Mexico and Central America) and the [[Incas]] in [[South America]] prior to the arrival of the Spanish conquerors. |