1920: Decatur Staleys (precursor of Chicago Bears) play first game.
1920: Michigan Avenue bridge, the first double-decker bascule bridge, opens.
1921: Eight White Sox players acquitted in Black Sox scandal but banned for life from baseball.
1921: Chicago Theater opens.
1922: Louis Armstrong joins King Oliver's Creole Jazz Band in Chicago.
1922: George Halas renames team Chicago Bears.
1923: Chicago divided into 50 wards.
1924: Richard Loeb and Nathan Leopold Jr. commit "thrill killing."
1925: Tribune Tower completed.
1926: Maurine Dallas Watkins writes the play "Chicago."
1927: Municipal Airport opens (later renamed Midway).
1928: "Amos 'n' Andy" debuts on Chicago's WMAQ radio.
1929: St. Valentine's Day massacre.
1930: Shedd Aquarium and Adler Planetarium open.
1930: Tribune reporter Jake Lingle shot dead, later exposed as mobster ally.
1931: Jane Addams wins Nobel Peace Prize.
1931: Gangster Al Capone convicted of income tax evasion.
1932: Democratic Convention in Chicago nominates Franklin Delano Roosevelt for president.
1933: Mayor Anton Cermak fatally shot in Miami.
1933: Museum of Science and Industry opens.
175 years of memorable, horrible, humorous and remarkable events that shaped Chicago
Chicago (Zbigniew Bzdak / July 1, 2011)