polarization has grown so extreme that voters in Red State America and Blue State America have a hard time even agreeing on the same facts. This has been going on since a solar system of right-wing news sites orbiting around Fox News and Breitbart News consolidated its gravitational hold over the Republican base, and it’s been exponentially accelerated by social media, which connects users with like-minded members and supplies them with customized news feeds that reinforce their preconceptions, allowing them to live in ever narrower, windowless silos.
