Answer:
Violence occurred between Free Soilers and people who were pro-enslavement in Kansas and in Congress.
Step-by-step explanation:
"Bleeding Kansas, Bloody Kansas, or the Border War was a series of violent civil confrontations in Kansas Territory, and to a lesser extent in western Missouri, between 1854 and 1859. It emerged from a political and ideological debate over the legality of slavery in the proposed state of Kansas" For more information look up bleeding Kansas :]