First Treaty of Chicago
The first treaty of Chicago was signed by Michigan Territorial Governor Lewis Cass and Solomon Sibley for the United States and representatives of the Ottawa, Ojibwe, and Potawatomi on August 29, 1821, and proclaimed on March 25, 1822.
The treaty ceded to the United States all lands in Michigan Territory south of the Grand River, with the exception of several small reservations.
At Chicago, Ottawa, Chippewa, and Potawatomi representatives signed a treaty August 29, 1821, giving up land in southwestern Michigan and also gave permission to build a road from Detroit to Chicago, completed in 1835.
Early Treaties at the Encyclopedia of the Chicago