The original Chicago flag, in 1917, had only two stars: one for the Chicago Fire and one for the World Columbian Exposition.

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The city had been incorporated for almost a century before the Chicago Flag Commission hosted a contest to design a new flag, and Wallace Rice's design won.

In 1933, a third star -- for the Century of Progress Exposition -- was added.

Finally, in 1939, the fourth star was added for the founding of Fort Dearborn.