Overview
The "Mormon" Kingdom of Mexico theory held that Mormon settlements in Mexico were more than exile communities or agricultural colonies. According to the theory, they were a strategic refuge where a disciplined religious population could regroup beyond U.S. legal reach.
Historical basis
Latter-day Saint colonies in northern Mexico were founded beginning in 1885, largely in response to U.S. anti-polygamy enforcement. These settlements developed in Chihuahua and Sonora and became stable communities with schools, farms, orchards, and church organization.
Their existence followed decades of American suspicion about Mormon political independence, militia organization, and territorial separatism. Earlier conflicts, especially the Utah War, had already established a public image of the Mormon community as capable of organized resistance.
Core claim
In its strongest form, the theory argued that the Mexican colonies were training grounds for a future Mormon military return to the United States. Some versions imagined a restored theocratic “Kingdom of God” extending across the border; others treated the colonies as reserve communities meant to preserve men, families, and arms for future action.
Revolution and suspicion
The Mexican Revolution intensified these fears. As violence spread, American observers were already inclined to treat the colonies as politically unusual. The 1912 exodus of many colonists back into the United States further dramatized the sense that the settlements had been semi-autonomous enclaves living under different political rules.
Evidence and assessment
The documentary record strongly supports the existence of Mormon colonies in northern Mexico, their connection to anti-polygamy pressures in the United States, and their disruption during the Mexican Revolution. It also supports earlier American fears about Mormon militia capacity. What it does not support is a documented secret army in Mexico preparing to reinvade or conquer the United States.
Legacy
The theory is part of a longer American tradition of interpreting mobile or separatist religious communities as hidden political states. In the Mormon case, the real cross-border settlement project gave the rumor a durable physical basis.