It's hard to believe that
The Big Sort: Why the Clustering of Like-Minded American is Tearing Us Apart, by Bill Bishop, was first published in 2008, because it felt very timely when I read it just a few years ago, and still very timely today. It's on sale right now at Kindle US for $1.99; not at Kobo US, at least as of now.
Kindle US:
https://www.amazon.com/Big-Sort-Clus...dp/B0077FAYES/
Kindle US/Smile:
https://smile.amazon.com/Big-Sort-Cl...dp/B0077FAYES/