Question: what do the 4 stars mean on chicago flag?
Answer: It initially had two stars, until 1933 when a third was added. The four star version has existed since 1939. ... The historic events represented by the stars are the establishment of Fort Dearborn, the Great Chicago Fire of 1871, the World's Columbian Exposition of 1893, and the Century of Progress Exposition of 1933–34.