While we commemorate 250 years of American History, we're reminded of the people and stories who were here before the establishment of the United States. For this conversation, we're joined by Dr. Angela Cooper, Site Services Specialist at Cahokia Mounds State Historic Site, to discuss a place that was once one of the biggest civilizations in North America, home to the Mississippian people and the largest pre-Columbian earthworks in the Americas.