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How Federal Anti-Polygamy Laws Dismantled Mormon Theocracy in Utah

Explore the key federal laws, including the Edmunds Act, that challenged and ultimately ended polygamy and the unique political power structure of the Latter-day Saints in Utah Territory.

By Garret Merkley · Explainer · Jun 3, 2026
Branched from Brigham Young's Theocratic Rule in Utah Territory: From Theory to Practice
Quick take
  • Federal anti-polygamy laws, culminating in the Edmunds Act, aimed to dismantle the practice of plural marriage and the theocratic governance of the LDS Church in Utah Territory.
  • These laws disenfranchised polygamists, seized church assets, and imposed severe penalties, creating immense pressure on the LDS community.
  • The legal and financial pressure ultimately led the LDS Church to issue the 1890 Manifesto, officially ending polygamy and paving the way for Utah statehood.

Federal anti-polygamy laws, enacted by the U.S. Congress primarily between 1862 and 1887, were a series of legislative acts designed to suppress the practice of plural marriage by members of The Church of Jesus Christ of Latter-day Saints (LDS Church) in Utah Territory and challenge its theocratic political influence. The most impactful of these was the Edmunds Act of 1882, later strengthened by the Edmunds-Tucker Act of 1887.

Early Legislation and the Morrill Anti-Bigamy Act (1862)

The first federal law specifically targeting polygamy was the Morrill Anti-Bigamy Act of 1862. It prohibited bigamy in U.S. territories and disincorporated the LDS Church, limiting its property holdings. However, enforcement was difficult due to local juries sympathetic to polygamists and a lack of clear legal mechanisms for prosecution. This act largely remained unenforced for two decades.

The Edmunds Act of 1882: A Major Turning Point

The Edmunds Act significantly escalated federal efforts. It redefined polygamy to include "unlawful cohabitation," making it easier to prosecute men living with multiple wives without needing direct proof of marriage ceremonies. It also barred polygamists from voting, holding public office, or serving on juries. This effectively disenfranchised a large portion of Utah's male population and opened the door for non-Mormons to gain political influence.

The Edmunds-Tucker Act of 1887: Intensifying the Pressure

The Edmunds-Tucker Act further tightened the screws. It disincorporated the LDS Church and its Perpetual Emigrating Fund, confiscating most of its assets (valued at millions of dollars) and placing them under federal control. It abolished women's suffrage in Utah (which had been granted by the territorial legislature in 1870, largely to boost pro-LDS votes) and required all voters and jurors to take an oath affirming they were not polygamists. This act severely crippled the Church's financial and political power.

These federal anti-polygamy laws were instrumental in dismantling the unique theocratic system that had developed in Utah Territory. By systematically disenfranchising polygamists, seizing church assets, and making enforcement inescapable, the U.S. government exerted immense pressure on the LDS Church. This pressure directly led to the issuance of the 1890 Manifesto by LDS President Wilford Woodruff, which officially advised members to cease plural marriage. This pivotal shift was a prerequisite for Utah's eventual statehood in 1896, marking the end of a long period of conflict between the federal government and the LDS Church over religious practice and secular governance.

What was "unlawful cohabitation"?
The Edmunds Act defined "unlawful cohabitation" as living with more than one woman, even without proof of a formal marriage ceremony. This made it much easier for federal prosecutors to secure convictions against polygamist men, as they no longer needed to prove the legal validity of multiple marriages.
Did the laws apply only to Mormons?
While the laws were broadly written to apply to all U.S. territories, they were specifically aimed at and almost exclusively enforced against members of The Church of Jesus Christ of Latter-day Saints in Utah and surrounding territories, as they were the primary group practicing polygamy at the time.
What happened to the confiscated church assets?
Most of the assets confiscated under the Edmunds-Tucker Act were eventually returned to the LDS Church by an act of Congress in 1896, shortly after Utah achieved statehood and the Church had formally abandoned polygamy.
How did these laws impact women?
The laws had a complex impact. While they aimed to "liberate" women from polygamy, they also disenfranchised all women in Utah by revoking their right to vote (granted in 1870), which many LDS women had used to support the Church's stance. For women in polygamous households, the laws often created economic hardship and social upheaval, as their husbands faced imprisonment or went into hiding.

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