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Bleeding Kansas, Bloody Kansas, or the Border War was a series of violent civil confrontations in Kansas Territory, United States, between 1854 and 1861 which emerged from a political and ideological debate over the legality of slavery in the proposed state of Kansas.
Bleeding Kansas was a mini civil war between pro- and anti-slavery forces that occurred in Kansas from 1856 to 1865. Following the passage of the Kansas-Nebraska Act in 1854, thousands of Northerners and Southerners came to the newly created Kansas Territory. ... Many Northerners intended to prevent slavery at all costs.