135 years after Mrs. O'Leary's cow burned the town down to the ground, over 8 million Chicagoans inhabit the 230 square milles that comprise the metropolitan area.
One of the country's leading financial, industrial and transportation centers, Chicago connects the St. Lawrence Seaway with the Mississippi Valley.
The US Army built Fort Dearborn here in 1803, on marshlands where the Potawatomi Indians previously gathered edible bulbs -- so C is correct.
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