THERE ARE EVENTS SO EPOCHAL that they create clear periods of before and after: Hiroshima; the fall of the Berlin Wall; 9/11. Eight years after he declared his intention to run for president, it’s now clear that we should consider Donald Trump’s 2016 campaign not as part of America’s political continuum but as one of these temporal dividing lines.

In American politics, there were conventions and candidates that existed in 2015 Republican politics as the before times. 2015 BT. Before Trump.

Before the escalator and “grab ’em by the p***y.” Before Muslim bans and a wall Mexico would never pay for. Before we’d heard of Marjorie Taylor Greene, or Lauren Boebert, or the QAnon shaman. Before an American president sided with Vladimir Putin over his own government’s intelligence network. Before Donald Trump became the first president to turn his back on.