Numerous new religious movements have developed during the history of the United States. Prior to the American Civil War, new movements included Mormonism, led by a prophet; Adventism, which used biblical scholarship to predict the Second Coming of Jesus; New Thought, which promised that mental powers could provide health and success; and Spiritualism, which offered communication with ghosts or spirits. By 1900, flourishing movements included the Jehovah's Witnesses, a group that emerged from Bible tract publishing; Theosophy, whose leader claimed to be in telepathic communication with Masters of the Ancient Wisdom; Christian Science, which promised spiritual healing; and Black Hebrew Israelites, built on a revelation that African Americans are descendants of the Biblical Hebrews. The 20th