Here's why:
* No Written Records: The Mississippian people did not have a written language, so we have no surviving texts from them.
* Lost Language: Over time, the language spoken at Cahokia died out. It's possible that the language evolved into other languages spoken by later Native American groups, but we have no way of knowing for sure.
* Linguistic Connections: Scholars believe the language spoken at Cahokia was related to other languages spoken by Native American groups in the area, such as the Muskogean languages. However, they cannot definitively link it to any specific language family.
So, while we don't know what the exact language was, we can say that it likely belonged to the broad family of indigenous languages spoken in the Mississippi Valley area.