The Kansas Border War was a period of violence in the Kansas Territory and parts of Missouri, between pro-slavery and anti-slavery forces in the mid-1850s. While the conflict is primarily associated with Kansas, it did extend into western Missouri, particularly the border counties that shared a border with Kansas. During this time, the term "Bleeding Kansas" was often used to describe the violence and bloodshed in the region. "Bleeding Kansas" refers to the bloodshed and turmoil caused by the conflict, particularly the frequent bloody confrontations between the two sides.
However, it's worth noting that the term "Bleeding Kansas" is commonly used to refer specifically to the events that occurred within the Kansas Territory itself. The extension of the conflict into Missouri was sometimes called "Bleeding Missouri" or "the Missouri-Kansas Border War." Nevertheless, the broader and more well-known term "Bleeding Kansas" is often used to encapsulate the entire conflict, including its effects on both sides of the border.