The Capture of Santa Fe occurred during the Mexican–American War as part of a broader United States strategy to secure territorial control over New Mexico and Alta California. General Stephen W. Kearny led the Army of the West, consisting of approximately 1,700 men, southwest from Fort Leavenworth, Kansas with orders to occupy the New Mexico Territory. Santa Fe, serving as the capital of the Mexican Province of New Mexico, became the target of this military campaign in August 1846.
Governor Manuel Armijo faced significant internal pressure on August 9 in Santa Fe when Catholic priests, Diego Archuleta (the young regular-army commander), and militia officers Manuel Chaves and Miguel Pino pushed him to mount a defense against the approaching American forces. In response, Armijo established a defensive position in Apache Canyon, a narrow pass located approximately 10 miles southeast of the city. However, on August 14, before the American army even came into view, Armijo reversed his decision and chose not to engage in battle. An American named James Magoffin claimed credit for persuading both Armijo and Archuleta to abandon their defensive stance, though an unverified account suggests he may have bribed Armijo to do so.
The engagement proved decisive without any military confrontation. Despite the insistence of Pino, Chaves, and some militiamen to fight, Armijo's order against resistance allowed the American occupation to proceed without violence. This bloodless capture demonstrated the vulnerability of Mexican defenses in the territory and solidified United States control over Santa Fe, a crucial step in Kearny's larger objective to secure the New Mexico Territory and Alta California.
The Mexican-American War (1846–1848) grew from the annexation of Texas (1845) and a disputed border between Texas and Mexico at the Rio Grande. President James K. Polk ordered US troops under General Zachary Taylor into the contested zone; after a skirmish that killed American soldiers, Congress declared war in May 1846. US forces won a series of engagements — Palo Alto, Monterrey, Buena Vista — before General Winfield Scott led an amphibious landing at Veracruz and an overland campaign to Mexico City, which fell in September 1847. The Treaty of Guadalupe Hidalgo (February 1848) transferred California, Nevada, Utah, most of Arizona and New Mexico, and parts of Colorado and Wyoming to the United States in exchange for $15 million and assumption of $3.25 million in claims — roughly 525,000 square miles, a 67 percent expansion of US territory. The war's outcome immediately reopened the slavery question: the Wilmot Proviso, debated throughout the war, proposed banning slavery from any territory acquired from Mexico, foreshadowing the sectional crisis of the 1850s.
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