I have an essay in today's NYT on America's growing polarization. Marc Hetherington and I show what's happened over the last 50 years, not just in Congress but among citizens, in 3 simple graphs.The first one is below, from McCarty, Poole, and Rosenthal. It shows that things were really polarized in the late 19th century, after the civil war, then they got much less polarized, but it's been a rapid climb upwards since the 1960s. We talk about why.


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