The 19th amendment of the U.S. Constitution, guaranteeing all American women the right to vote, was passed by Congress June 4, 1919 and ratified on August 18, 1920.
Learn more about the race to ratify and Illinois’ status as one of the first states to ratify at:
https://www.nps.gov/subjects/womenshistory/womens-suffrage-timeline.htm
https://www.thecaucusblog.com/2019/03/tbt-twenty-eight-words-that-changed.html