What Hath God Wrought: The Transformation of America, 1815-1848 is a nonfiction book about the history of the United States written by historian Daniel Walker Howe. Published in 2007 as part of the Oxford History of the United States series, the book offers a synthesis history of the early-nineteenth-century United States in a braided narrative that interweaves accounts of national politics, new communication technologies, emergent religions, and mass reform movements. The winner of multiple book prizes, including the 2008 Pulitzer Prize for History, reviewers widely praised What Hath God Wrought. Historian Richard Carwardine said it "lays powerful claim to being the best work ever written on this period of the American past."