1917. From the hoist outwards, the stars represent:

* Original to the 1917 flag: This star stands for the Great Chicago Fire of 1871. Its six points symbolize transportation, labor, commerce, finance, populousness, and salubrity (health).
* Original to the 1917 flag: This star symbolizes the World's Columbian Exposition of 1893. Its six points represent the virtues of religion, education,