Las Vegas, New Mexico held strategic importance during the Mexican-American War as a significant settlement on the Santa Fe Trail and the county seat of San Miguel County. The town's location and established infrastructure made it a key objective for United States forces advancing into New Mexico during the 1846 military campaign.
In 1846, General Stephen W. Kearny led the occupation of Las Vegas, delivering an address at the Plaza of Las Vegas to claim New Mexico for the United States. This action represented a pivotal moment in the assertion of American control over the territory during the Mexican-American War.
The occupation of Las Vegas by Kearny's forces contributed to the broader American military success in New Mexico during the Mexican-American War. However, the town later became a site of resistance when it was the location of the Battle of Las Vegas in 1847, which formed part of the Taos Revolt—an uprising by local Hispano populations against American occupation. This sequence of events demonstrates how initial American military victories were followed by significant local resistance to United States control in the region.
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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