CNN’s Critical counties: Watch Allegheny County, PA, in this election

2016, 2016 Presidential Campaign, Donald Trump, Featured County, Hillary Clinton, Pennsylvania

CNN draws attention to Allegheny County, Pennsylvania, home to Pittsburgh.

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Pittsburgh was a treasure of the industrial age, and as the times have changed, so has it. This blue pocket of the post-industrial United States sits in Allegheny County, a hub of urban and suburban life in western Pennsylvania. Far from the liberal hub of Philadelphia in the east, this county is the heart of battleground Pennsylvania.

If Hillary Clinton scores a big victory here, it’s a strong sign of her chances in this swing state. But if Trump sways this county, or turnout here is low, it could mean he takes Pennsylvania — putting him a lot closer to overall victory.

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CNN Editor’s Note:Critical Counties is a CNN series exploring 11 counties around the country that chief national correspondent John King has identified as key in the 2016 election. These counties could play an outsize role in the election and offer an instructive example of what the political parties have accomplished. Stark County is the fifth county in the series, which runs through Election Day. Explore the other critical counties.