John Brown's Pottawatomie Massacre of 24–25 May 1856 — carried out three days after the Sack of Lawrence — was a pivotal act of political violence that permanently polarized Bleeding Kansas. Brown and his men dragged five pro-slavery settlers from their cabins and hacked them to death with broadswords. The killings outraged even many abolitionists, touched off a summer of retaliatory guerrilla warfare across the territory, and began Brown's evolution from militant abolitionist to national revolutionary figure.
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.
5 pro-slavery settlers killed; no Brown men killed
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