Editing Millvale, Pennsylvania (section)

===20th century===
At the start of the [[Great Depression]], Millvale was a target of the [[Works Progress Administration]] which attempted to reign in [[Girtys Run|Girty’s Run Creek]]. The borough was also an important industrial center for America's effort in [[World War II]].

Following the conclusion of World War II, Millvale experienced an economic boom and, until 1952, the borough was served by the "3 Millvale" trolley operated by [[Pittsburgh Railways]].<ref>{{cite web|url=http://www.pittsburghtransit.com/index9.html|title=Pittsburghtransit.com - The Routes - PCC Operation|date=August 28, 2005|archive-url=https://web.archive.org/web/20050828213648/http://www.pittsburghtransit.com/index9.html|archive-date=August 28, 2005|access-date=August 9, 2009}}</ref> [[1970s energy crisis|America’s energy crisis]] and the [[Deindustrialization|downfall of the steel industries]] later led to a steady decline in population which continues through the present day.