I'll start by saying I know nothing about this county, but this is something people need to consider:
Let's consider a hypothetical county that is 80% White in the year 2000, and the only options on the ballot are Democrat or Republican.
Let's say in 2000, George W. Bush wins 58% of the White vote there and 25% of the minority vote, making it about average for what Republicans are getting now. Bush would win the county with 51.4% of the vote to Gore's 48.6%.
If you fast forward to 2008, and Whites and minorities vote literally EXACTLY the same, but the county is now 75% White and 25% minority, Obama would have won the county with 50.25% of the vote to McCain's 49.75%. If by 2016 the trend continued and the county was 70% White and 30% minority and voting patterns stayed the same, Hillary would have won 51.9%-48.1%.
We cannot assume that a county switching its voting patterns is due to the TYPES of voters we associate(d) with that county changing their political preferences.
This is exactly what happened in Georgia, by the way, between 2004 and 2016.
