Spiritualism's a monotheistic belief system or religion, postulating a belief in God, but the distinguishing feature's belief that spirits of the dead can be contacted, either by individuals or by gifted or trained "mediums", who can provide information about the afterlife. Spiritualism developed in the United States and reached its peak growth in membership from the 1840s to the 1920s, especially in English-language countries, By 1897, it was said to have more than eight million followers in t… (More on Spiritualist)