Pittsburgh: 1900-1945

By 1900, downtown Pittsburgh, known as the Golden Triangle, had become a classic central business district at the confluence of three rivers: the Allegheny, the Monongahela, and the Ohio. The valleys of the three rivers were lined with the factories and mills that made Pittsburgh the forge of the nation. Great industrialists such as Andrew Carnegie and George Westinghouse made Pittsburgh the center of the American iron, steel, aluminum, glass, and oil industries. With their success, money p...