Though the U.S. Constitution guarantees the free exercise of religion it does not specify what counts as a religion. From its founding in the 1830s Mormonism a homegrown American faith drew thousands of converts but far more critics. In <i>&#x201C;A Peculiar People&#x201D;</i> J. Spencer Fluhman offers a comprehensive history of anti-Mormon thought and the associated passionate debates about religious authenticity in nineteenth-century America. He argues that understanding anti-Mormonism provides critical insight into the American psyche because Mormonism became a potent symbol around which ideas about religion and the state took shape.<br/>Fluhman documents how Mormonism was defamed with attacks often aimed at polygamy and shows how the new faith supplied a social enemy for a public agitated by the popular press and wracked with social and economic instability. Taking the story to the turn of the century Fluhman demonstrates how Mormonism&#x2019;s own transformations the result of both choice and outside force sapped the strength of the worst anti-Mormon vitriol triggering the acceptance of Utah into the Union in 1896 and also paving the way for the dramatic yet still grudging acceptance of Mormonism as an American religion.