The Tamaroa were closely related to the Cahokia and as such were involved with the expeditions and missions established by Louis Joliet and Pere (Father) Jacques Marquette beginning in 1673.
With the signing of the Treaty of Paris, the end of French occupation of the Illini country was to signal the beginning of the end for all the tribes of the Illiniwek. This was due to them aligning with the French, angering the Iroquios, Fox, Chickasaw and Potawatomi.