Do Latter-day Saints believe God is a polygamist? Does the Church practice polygamy today? What is polygamy? When was LDS plural marriage introduced? Was Joseph Smith a polygamist?
Mormonism and polygamy
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Polygamy was practiced by leaders of the Church of Jesus Christ of Latter-day Saints for more than half of the 19th century, and practiced publicly from 1852 to 1890 by between 20 and 30 percent of Latter-day Saint families. Wikipedia