Mormonism (a k a The Church of Jesus Christ of Latter-Day Saints) was organized in 1830 in Fayette, New York. An angel named Moroni was supposed to have appeared to Joseph Smith, Jr., revealing to him the place where golden plates were buried which contained the history of ancient America.
Also, according to Mormon belief, Smith received a pair of special eyeglasses (called "Urim and Thummim") which turned the "reformed-Egyptian characters" of the plates into English. Smith had a friend copy down the writing on the plates as he (Smith) read it to him. Of course, Smith called this out to him from behind a curtain; so, no one except Joseph Smith saw the plates. This later became the Book of Mormon, claimed by the Mormons to be an additional "revelation" for these latter days. They say it is as authoritative and inspired as the Bible.
"Add thou not unto his words, lest he reprove thee, and thou be found a liar." (Proverbs 30:6)
In the early days the members of the group were forced from one part of the country to another. With their pagan teaching of polygamy and frequent charges of a criminal nature against their leaders, the followers were pushed from "pillar to post." Joseph and his brother, Hyrum, were finally shot to death by an angry mob while they were awaiting trial in jail.
Today the Mormons are divided into two groups: The Church of Jesus Christ of Latter-Day Saints, who followed Brigham Young after Smith's death, and the Reorganized Church of Jesus Christ of Latter-Day Saints, composed of those who gave their support to Smith's son instead of to Brigham Young. Those who followed Young are the larger of the two.