<Tr> <Th> Designed by </Th> <Td> Wallace Rice </Td> </Tr> <P> The flag of Chicago consists of two blue horizontal stripes or bars on a field of white, each stripe one - sixth the height of the full flag, and placed slightly less than one - sixth of the way from the top and bottom . Between the two blue stripes are four red, six - pointed stars arranged in a horizontal row . </P> <P> The flag, designed by Wallace Rice, was adopted in 1917 after Rice won the design competition for the flag . The three sections of the white field and the two stripes represent geographical features of the city, the stars symbolize historical events, and the points of the stars represent important virtues or concepts . The historic events represented by the stars are Fort Dearborn, the Great Chicago Fire of 1871, the World's Columbian Exposition of 1893, and the Century of Progress Exposition of 1933--34 . </P> <P> In a review by the North American Vexillological Association of 150 American city flags, the Chicago city flag was ranked second best with a rating of 9.03 out of 10, behind only the flag of Washington, D.C. </P>

Why are there four stars on the chicago flag
find me the text answering this question