The Indian civilization that once lived at the Cahokia Mound historical Site is believed to have reached a population of over 22,000 people. Archeologist and scientist have speculated on the purpose of each mound located on the site. Some are thought to have been used to build residences upon. The taller the mound the greater your status was in the society. Others are thought to have been used to mark changes in the seasons and important occurrences though out the year. The once prosperous Indian civilization seemed to have disappeared overnight and without a trace. There is no known reason why they abandoned their mound city, and the civilization has never reappeared anywhere throughout history or at other historical sites. Mound
