(pensive music) (dramatic music) The people who built Cahokia were part of an ancient civilization that's known today as the Mississippian cultures, Native Americans who lived around 800 to 1600 ...

When the founders of the United States designed the Constitution, they were learning from history that democracy was likely ...

Instead of imagining the thousands of people who once teemed on the grand plaza here, I keep returning to the fact that Cahokia Mounds in Illinois is one of only eight cultural World Heritage ...