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William Miller claimed he knew the date of Jesus’s Second Coming. He calculated the date, October 22nd, 1844, using the Bible. He published a book and did a speaking tour to spread the word and achieve his of gain thousands of followers. There were also papers created to spread the date of the end of the world.

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People sold their belongings because there would be no one to take care of them when they were gone. Some Millerites were impoverished. The reinterpreted the October 22nd as the day of Christ’s cleansing of his heavenly sanctuary. Seventh Day Adventists continue his teachings.

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Miller was a former captain in the War of 1812. Miller converted from Baptism to Deism in 1816. Miller's enthusiasm, plus the pressures of an economic depression, drew thousands of converts. After analyzing several documents, he concluded that Christ would reappear about 1843 which led to his involvement in the authoritative roles.

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By interpreting these prophetic days as years and beginning from the date of the prophecy (placed by James Ussher at 457 B.C.), Miller concluded that the end of the 2,300 "days" would fall in 1843. Miller the man was transformed overnight into the Millerite Movement by his revelation. By putting a date on second coming, he birthed this movement.