In the 1880s, the first steel mill was built in Pittsburgh. By the 1950s, the city’s top export had helped power the Industrial Revolution and supplied crucial materials during World War II.
Source: The Tribune-Review
In the 1880s, the first steel mill was built in Pittsburgh. By the 1950s, the city’s top export had helped power the Industrial Revolution and supplied crucial materials during World War II.
Source: The Tribune-Review