Bleeding Kansas

On this day in 1861, the State of Kansas entered the United States as a free state, following five years of violent clashes over whether slavery would be legal in the Kansas territory (established on the unceded lands of the Kansa/Kaw, Kiowa, Osage, and Pawnee Nations, among others).

Can there be a role for violent struggle in liberation? If so, what is it? If not, how do we avoid it?