A sprawling Native American city stretching six square-miles and home to roughly 20,000 people disappeared from the river valley over 600 years ago.
And while the 'Cahokia' tribe mysteriously vanished, archaeologists have uncovered artifacts from the society that could provide clues about the group - their culture, language, and even their downfall are still lost to history.
The team university researchers recently discovered pottery, tools, like 'micro-drills,' and wall trenches at the site, dating back approximately 900 years.
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