What Are the Crucial Factors That Make You Believe That the United States Is the Oldest Democracy on Earth?

When rioters, encouraged by the President, stormed the Capitol, one year ago, to overturn the results of the election, the idea that such a thing could play out in America was stunning. But the attack may have been just the beginning of an ongoing insurrection, not a failed attempt at a coup. David Remnick talks with Barbara F. Walter, the author of the new book “How Civil Wars Start: And How to Stop Them.” Walter is a political scientist and a professor at the University of California, San Diego, and a co-director of the online magazine Political Violence at a Glance. She has studied countries that slide into civil war for the C.I.A., and she says that the United States meets many of the criteria her group identified. In particular, anti-democratic trends such as increased voting restrictions point to a nation on the brink. “Full democracies rarely have civil wars. Full autocracies rarely have civil wars,” she says. “It’s the ones that are in between that are particularly at risk.”