Articles:

https://en.wikipedia.org/wiki/Mississippian_culture

Videos:

• Ancient Americas, “Cahokia: Mississipian Metropolis”, https://www.youtube.com/watch?v=iciOvaIm51M
• Lesser Known History, “The Mississipian culture: the lost American civilization”, https://www.youtube.com/watch?v=LcxY_AgCMoo
• SciShow, “The Rise and Fall of Cahokia: North America’s First City”, https://www.youtube.com/watch?v=PS1TD6WFNeQ
• Study of the Antiquity and the Middle Ages, “Ancient Mississippian Religion”, https://www.youtube.com/watch?v=JkxZ_B4yoBE