<Li> "Windy City"--The origins of this name are disputed; see Windy City (nickname). </Li> <Li> "Chi - Town"--This nickname is also used for the hockey teams Chi - Town Shooters and Chi - Town Shamrocks . </Li> <Li> "Second City"--By one possible etymology, this refers to the fact that Chicago had the second largest metropolitan area in the United States for most of the 20th century (Los Angeles is now larger). Alternatively, it may refer to the rebuilding of the city between the Great Chicago Fire of 1871 and the World's Columbian Exposition of 1893 . </Li> <Li> "City of the Big Shoulders"--This nickname is taken from the fifth line of Carl Sandburg's poem "Chicago". </Li>

Why do they call chicago the 2nd city
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