Is Pennsylvania drifting towards solid GOP?

[This is Eharding, guys]

You must be logged in to read this quote.

Are you sure you calculated correctly? Because I'm getting 30.72% growth in the Clinton counties and 40.61% growth in the Trump counties, by your numbers, which seems correct, given the decline in Philadelphia. It's impossible for the growth rate of both to be simultaneously higher than 35%, like you got.

[This is Eharding, guys]

In 1980, they cast 993,090 votes, and in 2016, they cast 1,192,862 votes. That's a 20.12% growth in vote totals since 1980. The state, remember, cast 35% more votes in 2016 than 1980, so Western Pennsylvania's growth has been 15% below the state's average, which means that the Democratic counties in Southeast Pennsylvania are possibly performing above the state average to compensate.  

And yet, Trump counties still grew ten percentage points more in votes than Clinton counties in PA from 1980 to 2016. I suspect areas like York and Lancaster counties are making up the difference.