... head of family who had improved farms in Illinois prior to 1788......1791 By the treaty of Greenville, sixteen tracts 6 miles square in Illinois are ceded by the Indians; one at the mouth of the Chicago River , where a fort formerly stood ......Aug. 3, 1795 Site of Peoria fixed by the abandonment of a settlement called La Ville de Maillet, located farther up the lake in 1788......1796 Jean Baptist...