What name was given to the fight between proslavery and antislavery?

The conflict between proslavery and antislavery factions in the United States, particularly in the context of Kansas in the 1850s, was known as "Bleeding Kansas." This violent struggle arose as both sides sought to influence whether Kansas would enter the Union as a free or slave state, resulting in numerous confrontations and bloodshed. The term encapsulates the broader national tensions leading up to the Civil War.