Written in elegiac prose, Lepore's groundbreaking investigation places truth itself--a devotion to facts, proof, and evidence--at the center of the nation's history. The American experiment rests on three ideas--"these truths," Jefferson called them--political equality, natural rights, and the sovereignty of the people. And it rests, too, on a fearless dedication to inquiry, Lepore argues, because self-government depends on it. But has the nation,...