Chicago (Zbigniew Bzdak / July 1, 2011)

1969: John Hancock Center opens as city's tallest building.

1970: First Chicago gay pride parade.

1971: Jesse Jackson forms Operation PUSH.

1971: Union stock yards close.

1972: United Flight 553 crashes near Midway, killing 43 of 61 aboard, and two on ground.

1973: Construction finished on Sears Tower (now Willis Tower), world's tallest building until 1997.

1974: Columbia College fully accredited.

1974: Federal judge rules police department eligibility tests discriminate against blacks, Latinos and women.

1974: David Mamet's play "Sexual Perversity in Chicago" premieres.

1975: Deep Tunnel project begun.

1976: Richard J. Daley dies.

1976: Saul Bellow wins Nobel Prize for literature and Steppenwolf Theater opens.

1977: Elevated train derails in Loop, killing 11 and injuring about 200.

1977: Art Institute installs Marc Chagall's famous windows.

1977: Chicago Marathon debuts.

1978: Demise of Chicago Daily News.

1979: American Airlines Flight 191 crashes, killing 273.

1979: Pope John Paul II holds mass in Grant Park.

1979: Jane Byrne elected city's first female mayor.

1980: Taste of Chicago debuts on North Michigan Avenue.