Cahokia treaties from the National Archives, and land Cessions from the Forestry Service.
Ratified Indian Treaty 99: Tribes of the Illinois Nation (Peoria, Kaskaskia, Michigamea, Tamaroa, and Cahokia) - Edwardsville, Illinois Territory, September 25, 1818
Ratified Indian Treaty 99: Tribes of the Illinois Nation (Peoria, Kaskaskia, Michigamea, Tamaroa, and Cahokia) - Edwardsville, Illinois Territory, September 25, 1818
Cession: 96a
Ratified Indian Treaty 178: Kaskaskia and Peoria (including Michigamea, Cahokia and Tamaroa) - Castor Hill, Missouri, October 27, 1832