 Other allusions to the state 's people , places , and events include the Black Hawk War , author Carl Sandburg , Stephen A. Douglas , Abraham Lincoln , the Sangamon River , the Chicago Cubs , the Sears Tower dubbed " Seer 's Tower " ( now called Willis Tower ) , and the localities of Jacksonville , Peoria , Metropolis , Savanna Caledonia , Secor , Magnolia , Kankakee , Evansville , and the several locations named Centerville , Illinois . During the tour following the release of Illinois , Stevens ' band wore cheerleader outfits based on those of the University of Illinois . 
