Millerites
The most catastrophic failed doomsday prediction in recent history
1831 - 1845
After an extensive study of Biblical prophecies, William Miller believed that the end of the world was imminent and that he must warn everyone. Throughout the 1840s, his research was distributed throughout America, sparking a national movement as up to one million people traveled to hear him speak. Eventually, he announced the exact date of the apocalypse, and his followers started giving away everything they owned in anticipation. However, the predicted date came and went, and nothing happened.
This event shook the nation and became one of the most significant historical events in American history due to its devastating and life-changing impact on such a large number of people. Thousands of Americans were left without jobs or property, and the widespread ridicule against them prevented them from reintegrating into society.
While many people left the movement after the prediction was proven false, others had already given up too much or were already too convinced of Miller's teachings to simply abandon their faith. These members started to band together and formed many radical sects, such as the Seventh-Day Adventists, Jehovah's Witnesses, and Branch Davidians.
Religion: Christianity
Denomination: Adventist (precursor)
Founder: William Miller
Location: Northeastern United States, especially New York
Founded: 1831
Ended: 1845
Size: 100,000
Believed the world would end on 22 October 1844 (source)
Other info:
After the Great Disappointment, some members believed that the world had entered the Sabbath Millenium and that the saved didn't have to work (source p. 348)
Some members acted like children after the Great Disappointment because of the teaching in Mark 10:15, "Truly, I say to you, whoever does not receive the kingdom of God like a child shall not enter it." (source p. 348)
After the great disappointment, Miller formally established the Adventist denomination (source)
Podcast about the Millerites