Decade that a county peaked in population:

So thats a pretty good correllation, eyeballing it, its basically the areas that haven't had any real economic growth in decades, and are overwhelming populated by old people, and of course generally de facto have low populations.

If a population peaked in decade x, well, its been shrinking since then.

They are the past, lashing out violently as the light dims... they were never able to figure out why everything sucks for them now.

I'd bet you could make this a better corellation if you did 'decade that white population peaked'.

And then even better if you also did 'decade that white, non college educated population peaked.'

Dumb, dying, racist failures.

Doesn't seem like it,

There is a high visual correlation I some places but others like Kentucky and West Virginia have high votes and population.