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The Morrill Act of 1862: America's First Federal Law Against Polygamy

Signed during the Civil War, the Morrill Act targeted polygamy and church property in U.S. territories, setting a precedent for federal intervention.

By Garret Merkley · Explainer · Jun 10, 2026
Branched from Utah's Path to Statehood: How Federal Law Dismantled Mormon Theocracy and Polygamy
Quick take
  • The Morrill Act of 1862 was the first federal law to outlaw polygamy in U.S. territories.
  • It also limited the amount of property religious organizations could hold in territories to $50,000.
  • Passed during the Civil War, it established a legal framework for federal authority over territorial practices.
  • While difficult to enforce initially, it laid the groundwork for future anti-polygamy legislation.

The Morrill Anti-Bigamy Act of 1862 was a United States federal law that outlawed polygamy in all U.S. territories and limited the amount of real estate any religious corporation or organization could hold in those territories to $50,000. Signed by President Abraham Lincoln during the Civil War, it specifically targeted the practice of plural marriage by members of The Church of Jesus Christ of Latter-day Saints (LDS Church) in the Utah Territory.

Outlawing Plural Marriage

The primary aim of the Morrill Act was to make polygamy a federal crime in the territories. It stated that any person having a husband or wife and then marrying another person in a U.S. territory would be subject to a fine of up to $500 and imprisonment for up to five years. This provision directly challenged the practice of plural marriage, which was a deeply held religious doctrine and social custom among many Latter-day Saints at the time. However, enforcing this part of the law proved difficult due to local resistance in Utah and the federal government's preoccupation with the Civil War.

Limiting Church Property Holdings

Beyond polygamy, the Morrill Act also sought to curb the economic power of the LDS Church by limiting the value of real estate any religious organization could own in a territory to $50,000. Any property acquired by such organizations beyond this limit was subject to forfeiture to the United States government. This provision was intended to weaken the church's institutional influence and control over vast tracts of land and resources in Utah and other territories where it held significant sway.

A Statement of Federal Authority

While often overshadowed by the Civil War, the Morrill Act represented a significant assertion of federal authority over moral and social practices within U.S. territories. Congress viewed territories as direct wards of the federal government, giving it the power to legislate on matters of public order and morality. The act effectively declared that the federal government would not tolerate practices it deemed contrary to national values, even if those practices were rooted in religious belief within a territory.

The Morrill Act of 1862 matters because it established the legal precedent for federal intervention against polygamy, laying the groundwork for more aggressive and enforceable legislation in the decades that followed, such as the Edmunds Act of 1882 and the Edmunds-Tucker Act of 1887. Although it was largely unenforced in its initial years, its existence signaled the federal government's long-term commitment to ending plural marriage, which eventually became a key condition for Utah's statehood. It highlighted the tension between religious freedom, federal power, and evolving societal norms in 19th-century America.

Why was the Morrill Act passed during the Civil War?
Despite the Civil War, President Lincoln's administration saw the Morrill Act as a way to assert federal authority over territories and address what many perceived as a moral issue. While the war effort took precedence, the act served as a statement of national values and the federal government's intent to legislate on territorial matters.
Was the Morrill Act immediately effective in stopping polygamy?
No, it was not. Due to the federal government's focus on the Civil War and strong local resistance in Utah, the Morrill Act was largely unenforced in its early years. Its primary impact was setting a legal precedent rather than immediate eradication of polygamy.
What was the significance of the $50,000 property limit?
The $50,000 property limit was designed to curb the economic and institutional power of the LDS Church, which was seen as controlling significant wealth and land in the Utah Territory. It aimed to dismantle the church's economic foundation and reduce its influence over territorial affairs.
How did the Morrill Act relate to Utah's path to statehood?
The Morrill Act was the first in a series of federal laws that created legal obstacles for Utah's statehood. The federal government made the abandonment of polygamy a prerequisite for Utah to join the Union, and this act began the long legislative battle to achieve that goal.

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