The capture of Santa Fe occurred during the Mexican–American War as part of a broader United States strategy to secure territorial control in the Southwest. General Stephen W. Kearny led approximately 1,700 men of the Army of the West southwest from Fort Leavenworth, Kansas with orders to secure the New Mexico Territory and Alta California. The engagement took place near Santa Fe, New Mexico, the capital of the Mexican Province of New Mexico, between August 8 and 14, 1846.
The military situation developed around Governor Manuel Armijo's defensive efforts. On August 9, Armijo faced pressure from Catholic priests, Diego Archuleta (the young regular-army commander), and young militia officers Manuel Chaves and Miguel Pino to mount a defense against the advancing American force. Armijo established a defensive position in Apache Canyon, a narrow pass located approximately 10 miles southeast of Santa Fe. However, the crucial moment came on August 14, when Armijo decided not to fight before the American army was even in view. An American named James Magoffin claimed responsibility for convincing Armijo and Archuleta to avoid battle, though an unverified account suggests he may have bribed Armijo. Despite insistence from Pino, Chaves, and some militiamen that they should engage in combat, Armijo ordered against the fight.
The capture resulted in a bloodless American occupation of Santa Fe. Notably, no shots were fired during the capturing of the city, making it a significant military objective gained without combat. This peaceful outcome allowed Kearny to secure New Mexico Territory as part of his broader mission to establish American control over the region during the Mexican–American War.
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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