1920
KDKA made nation's first commercial broadcasting Nov 2nd
1921
Robert Morris University is founded
1922
William A. Magee (republican) became Pittsburgh's 46th mayor
1923
Sixteenth Street Bridge opened Oct 9th
1924
The Liberty Tunnels opened in January
1924
Washington Crossing Bridge opened Dec 29th
Originally built to accommodate two lanes of traffic and one streetcar line.
1925
Blawnox became a municipality April 13th
1925
Pirates win the World Series
1926
Charles H. Kline (republican) became Pittsburgh's 47th mayor
1926
The Andy Warhol Bridge (7th Street) opened June 17th
1926
The Rachel Carson Bridge (9th Street) opened Nov 26th
1928
The Benedum Center Opens Feb 27th
1928
Fred Rogers was born in Latrobe, PA March 20th
1928
The Liberty Bridge opened March 27th
1928
The Roberto Clemente Bridge (6th Street) opened Sept 29th
1928
The 31st Street Bridge opened
1929
Amateur Astronomers Association of Pittsburgh was founded