President James K. Polk had devised a strategy to force Mexico to negotiate by invading central Mexico via the Gulf Coast port of Veracruz. As part of this plan, Polk ordered Major General Zachary Taylor to remain in his position at Monterrey, while General Winfield Scott was placed as commander of all U.S. forces in Mexico. Scott reinforced Polk's order, instructing Taylor to stay in place. This strategic positioning set the stage for the Battle of Buena Vista, which occurred on February 22–23, 1847, near the village of Buena Vista in the state of Coahuila, approximately 12 km (7.5 mi) south of Saltillo, Mexico.
The battle was fought between U.S. forces, largely composed of volunteers, under General Zachary Taylor, and the much larger Mexican Army commanded by General Antonio López de Santa Anna. The engagement took place at La Angostura, the local name meaning "the narrow place," where the two armies met in direct confrontation during the Mexican–American War.
The outcome of the battle remained ambiguous, with both sides claiming victory. Santa Anna's forces withdrew from the field after taking war trophies including cannons and flags, leaving the battlefield to the U.S. forces. The American troops were surprised by Santa Anna's withdrawal, as they had anticipated additional days of intense fighting ahead.
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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