 After 1832, the Potawatomi ceded all of their land along the Kankakee and Illinois rivers to the United States.Most Potawatomi left the area by the end of the decade, except for Chief Shaw-waw-nas-see, whose grave is commemorated by a boulder along the nature trail at Rock Creek.Noel Le Vasseur and other fur traders, including Hubbard Chabare and Francois Bourbonnais, traded with the Potawatomi along the Kankakee and Iroquois rivers in the 1820s.