1900
Carnegie Mellon University was founded
1901
Bridgeville became a municipality July 27th
1902
Cheswick became a municipality
1903
Clairton became a municipality
1905
Ambridge became a municipality
1905
West View became a municipality
1906
West View Park opened May 23rd
1909
Dormont became a municipality March 31
Dormont was originally fashioned as a borough from parts of Scott and Union Townships. An order of incorporation was signed on March 31, 1909, making Dormont the first independent municipality in the South Hills of Allegheny County.
1909
Forbes Field opened June 30th
1909
Pirates win the World Series