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    Pittsburgh, PA

    While the city is historically known for its steel industry, today its economy is largely based on healthcare, education, technology, robotics, and financial services. The downturn of the steel industry left no steel mills within the City of Pittsburgh and only two remaining mills in the county, though more than 300 steel-related businesses remain in the area. By contrast, the region supports 1,600 technology companies, ranging from a Google campus to small startups. The city has redeveloped abandoned industrial sites with new housing, shopping and offices, such as SouthSide Works and Bakery Square.