Chicago (Zbigniew Bzdak / July 1, 2011)

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.