President Trump suggested Thursday that the 2020 elections be postponed. To be clear: Trump does not have the power to reschedule voting. Election dates are set by statute dating to 1845, and no U.S. presidential election has ever been postponed. Trump’s call for a delay is an outrageous break with American faith in democracy. This year won’t be the first time Americans have voted amid disruption and crisis. U.S. democracy has functioned through wars and previous public health emergencies, as history shows. In November 1864, the Civil War still raged, with hundreds of thousands dead or wounded. President Abraham Lincoln thought he was likely to lose the election to former general George McClellan, who proposed ending the war with slavery intact. Lincoln was so gloomy about his chances that he wrote a memo to his Cabinet, to be unsealed only after Election Day, that assumed he had lost. (He urged his officials “to save the Union between the election and the inauguration, as [his opponent] will have secured his election on such ground that he can not possibly save it afterwards.”) Last-minute military victories, especially the Army’s capture of Atlanta, swung support toward Lincoln. Voting was not easy, and circumstances led to innovation. The first widespread use of absentee ballots let Union soldiers vote, providing Lincoln’s margin of victory. Two days after his reelection, Lincoln spoke to a crowd serenading him at the White House. There were “emergencies,” he noted. “But the election was a necessity,” he declared. “We can not have free government without elections; and if the rebellion could force us to forego, or postpone a national election, it might fairly claim to have already conquered and ruined us.” That faith in democracy has been evident when Americans have voted during other national emergencies.