Kevin Seefried did what the rebel army never could. On 6 January 2021, the 53-year-old carried a Confederate flag through the US Capitol. For historians of the American civil war such as Heather Cox Richardson, it was like a blow to the solar plexus. “The whole point of a civil war was to make sure that battle flag never had influence in the United States Capitol,” she says, via Zoom from near Augusta, Maine. “With a loss of almost $6bn and 600,000 lives, they kept that flag out of the Capitol, and then, I’m sorry, but those fuckers brought it...