Nickname for the events in KansasAlso known as the Kansas Border War. Following the passage of the Kansas-Nebraska Act, pro-slavery forces from Missouri, known as the Border Ruffians, crossed the border into Kansas and terrorized and murdered antislavery settlers. Antislavery sympathizers from Kansas carried out reprisal attacks, the most notorious of which was John Brown's 1856 attack on the settlement at Pottawatomie Creek. The war continued for four years before the antislavery forces won. The violence it generated helped percipitate the Civil War.

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