2000 to 2008 dosent seem to change all that much tbh. It's not until the gerrymandering kicked in after 2008 did we see such extreme polarization.
These are county maps, not CD maps. So how would it be impacted by gerrymandering? The county boundaries don't change from one decade to the next.
Gerrymandering contributes to polorazation
In congressional districts, not in counties. Counties aren't gerrymandered.
He's saying that living in gerrymandered districts makes people become MORE polarized than they were previously.
But overall, I say this article is not about gerrymandering.