Who created the conflict that characterized the characterized the kansas territory as bleeding kansas?

The conflict known as "Bleeding Kansas" was primarily created by the contentious debate over the expansion of slavery into the Kansas Territory following the passage of the Kansas-Nebraska Act in 1854. This act allowed settlers in those territories to decide whether to allow slavery, leading to violent clashes between pro-slavery and anti-slavery factions. Key figures, such as abolitionist John Brown and pro-slavery advocates, played significant roles in escalating the violence. The struggle represented broader national tensions that ultimately contributed to the Civil War.