History of slavery in Kansas
While cotton never had a significant role in Kansas' early agrarian economy, there were a few plantations and slaves along the Missouri River during the pre-Territorial period. Starting with the organization of Kansas Territory in 1854, there was a state-level civil war over slavery. See Bleeding Kansas..
Armed civil conflict
The presence of slaveowners in Kansas, particularly slaveowners who had migrated from the neighboring slave state of Missouri in order to guarantee the future state's entry into the Union as a slave state, served as a motivating factor for Northern abolitionist movements to move into the Kansas territory in order to prevent such efforts from succeeding. This resulted in the armed conflict known as Bleeding Kansas, a prelude to the Civil War.