Sentence:  The revenue from O ' Banion 's Cicero territory went up still higher , until the yield was more than the Torrio-Capone takings from the far bigger trade area of <WSD>Chicago</WSD> 's South and West Sides . 
Meaning of the word marked with <WSD> tags:  largest city in Illinois; a bustling Great Lakes port that extends 26 miles along the southwestern shoreline of Lake Michigan