Americans are far more divided than other Westerners over basic issues, including wealth inequality, health care, climate change, evolution, the literal truth of the Bible, apocalyptical prophecies, gender roles, abortion, gay rights, sexual education, gun control, mass incarceration, the death penalty, torture, human rights, and war. The intense polarization of U.S. conservatives and liberals has become a key dimension of American exceptionalism—an idea widely misunderstood as American superiority. It is rather what makes America an exception, for better or worse. While exceptionalism once was largely a source of strength, it may now spell decline, as unique features of U.S. history, politics, law, culture, religion, and race relations foster grave conflicts and injustices. They also shed light on the peculiar ideological evolution of American conservatism, which long predated Trumpism. Anti-intellectualism, conspiracy-mongering, radical anti-governmentalism, and Christian fundamentalism are far more common in America than Europe, Canada, Australia, and New Zealand. Drawing inspiration from Alexis de Tocqueville, Mugambi Jouet explores American exceptionalism’s intriguing roots as a multicultural outsider-insider. Raised in Paris by a French mother and Kenyan father, he then lived throughout America, from the Bible Belt to New York, California, and beyond. His articles have notably been featured in The New Republic, Slate, The San Francisco Chronicle, The Huffington Post, and Le Monde. He teaches at Stanford Law School.