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The Missouri-Mormon War: Land, Power, and Religious Conflict

An explainer on the violent clashes between Mormon and non-Mormon settlers in 1830s Missouri over land, political influence, and religious differences.

By Garret Merkley · Explainer · Aug 16, 2026
Branched from How Mormon Church Leadership Directed Settlement Patterns Across the American Frontier
Quick take
  • The Missouri-Mormon War was a series of violent conflicts in the 1830s between Latter-day Saints and other settlers.
  • Disputes centered on land ownership, political power, and cultural differences, fueled by religious prejudice.
  • It led to mob violence, state-sanctioned expulsion, and profound consequences for early Mormon history.
  • This conflict significantly shaped the Church's westward migration and its community identity.

The Missouri-Mormon War refers to a series of escalating tensions and violent confrontations that occurred primarily between 1831 and 1839 in various counties of Missouri. These clashes involved members of the Church of Jesus Christ of Latter-day Saints (Mormons) and their non-Mormon neighbors, stemming from deep disagreements over land acquisition, political control, and cultural practices, all exacerbated by significant religious prejudice.

How Land and Politics Fueled the Fire

When members of the Church of Jesus Christ of Latter-day Saints began settling in Missouri, particularly in Jackson County, their communal approach to land ownership and rapid population growth quickly created friction. They often purchased large tracts of land collectively, leading existing non-Mormon settlers to fear being economically displaced or outmaneuvered in land speculation. This rapid influx also threatened the established political order. Mormons tended to vote as a bloc, quickly becoming a majority in some areas, which non-Mormons perceived as an attempt to seize political control and impose their religious laws.

Cultural and Religious Differences

Beyond land and politics, profound cultural and religious differences deepened the divide. Mormon beliefs, such as their claim to Missouri as a promised land and their communal economic practices, were often viewed with suspicion and hostility. Their open missionary work and unique social customs were seen as clannish and exclusive. Additionally, the predominantly Southern-leaning Missourians, many of whom were slaveholders, often viewed the incoming Mormons—many from abolitionist-leaning states—with distrust, fearing they would disrupt the state's stance on slavery. These differences, coupled with sensationalized rumors and misunderstandings, created an environment ripe for conflict.

Escalation to Violence and Expulsion

Tensions steadily escalated from verbal threats and property destruction to organized mob violence. Incidents like the destruction of the Mormon-owned printing press in Independence in 1833 and the Battle of Crooked River in 1838 marked significant outbreaks of fighting. These culminated in Missouri Governor Lilburn Boggs issuing his infamous “Extermination Order” in October 1838, which declared Mormons to be enemies of the state and authorized their expulsion or extermination. This order led to further violence, including the Haun's Mill Massacre, where 17 Mormons were killed, and ultimately resulted in the forced expulsion of nearly all Latter-day Saints from Missouri by early 1839.

The Missouri-Mormon War is a crucial chapter in American religious and frontier history. It highlights the fragile nature of religious freedom in the early republic and the dangers of unchecked mob rule and state-sanctioned persecution against minority groups. The experience profoundly shaped the identity and trajectory of the Church of Jesus Christ of Latter-day Saints, contributing to their eventual migration west to Illinois and then to the Utah Territory, fostering a strong sense of community and a lasting distrust of external authority.

Where did most of these conflicts take place?
The primary conflicts occurred in western Missouri, particularly in Jackson, Clay, Caldwell, and Daviess counties.
What was the "Extermination Order"?
Issued by Governor Lilburn Boggs in 1838, it officially declared Mormons to be enemies of the state and authorized military force to either expel them from Missouri or exterminate them if they resisted.
Did the Mormons fight back during the conflict?
Yes, while often outnumbered, Mormons did organize militias and engaged in defensive actions and skirmishes, such as the Battle of Crooked River, to protect their communities and property.
What happened to the Mormons after their expulsion from Missouri?
After being driven from Missouri, the majority of Mormons settled in Nauvoo, Illinois, where they built a thriving city before facing renewed persecution and eventually migrating further west to the Utah Territory.
Was slavery a major factor in the conflict?
Yes, slavery was a significant underlying tension. Missouri was a slave state, and many non-Mormon settlers viewed the predominantly Northern and often abolitionist-leaning Mormons with suspicion, fearing their presence would destabilize the institution of slavery.

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