||Basketball invented at Springfield, Mass., by James Naismith.
||Chicago (Austin) becomes first Illinois secondary school to organize a girls basketball team.
||Chicago (Austin) defeats Oak Park (O.P.-River Forest) in first known girls basketball game between Illinois high schools.
||Four Chicago area girls teams form first high school basketball league in Illinois.
||Chicago Public School Superintendent Edwin G. Cooley prevents Chicago girls teams from organizing annual basketball league.
||IHSAA prohibits high school girls from participating in interscholastic athletics, particularly basketball.
||Illinois League of High School Girls Athletic Associations (ILHSGAA) formed to promote girls athletics.
||ILHSGAA absorbed into IHSAA.
||First "telegraphic" (or "postal") basket-shooting contest sponsored by the IHSAA.
||IHSAA (Illinois High School Athletic Association) becomes IHSA (Illinois High School Association); private schools allowed to join IHSA.
||IHSA allows girls to participate in interscholastic basketball contests.
||Final "postal" basket-shooting contest conducted.
||First state girls basketball tournament held at Horton Fieldhouse on the campus of Illinois State University at Normal; Sterling defeats Washington in title game.
||State final tournament moved to Assembly Hall in Champaign.
||Sub-regional stage (for small schools only) replaced by district tournament stage.
||Tournament split into Class A (small schools), won by Benton, and Class AA (large schools), won by East St. Louis (Lincoln); district tournament stage eliminated.
||In one-year experiment, state final field reduced from eight teams to four; quarterfinal games held at four sites.
||First tournament played under new rule allowing three-point field goal.
||Teutopolis becomes first school to win three consecutive titles.
||Class AA teams seeded in sectional complexes instead of at the regional stage; regional games played on court of higher seed.
||State final tournament moved to Redbird Arena in Normal and split
into two consecutive weekends, Class A and Class AA, held prior to the boys
||"Happening" three-point contest held for first time.
||Chicago Public League champion no longer given automatic berth in
Class AA state finals; Public League teams enter tournament at regional level in
either Class A or Class AA; Class AA teams seeded in modified sectional complex with fixed regional sites.
||Class A teams seeded in modified sectional complex with fixed regional
sites, divided into two sub-sectionals.
||Some Class AA sectionals seeded in two sub-sectionals.