Spiritualism. By Jesus Luna Jan 1, 1840 Beginning of Spiritualism. May 9, 1865 Spiritualism is blamed for starting U.S. Civil War. Jan 1, 1870 8M people follow belief in U.S and Europe. Dec 31, 1880 Credibility and informal Movement weakens. Dec 31, 1920 Spiritualism isn't practiced much. May 2, 2016 Practiced in U.S, Canada, and U.K..