Jill Lepore is a New Yorker staff writer and a historian at Harvard University. She tells David Remnick that her new book is the result of a dare: to tell—or even to understand—the story of this country, from the Age of Discovery through the present day, in one volume. In “These Truths,” Lepore surveys six-hundred-odd years of American history, paying particular attention to themes of immigration, suffrage, and how the media has shaped our democracy. Above all, Lepore grapples with whether the United States has lived up to the promises of its founding. She finds an America alternately fearful of change and fearful of stagnation, trapped between idealizing the past and hoping for a better future. The journey toward progress, Leporesays, is less a march than a stumble.