Bleeding Kansas, Bloody Kansas or the Border War, was a series of violent events, involving anti-slavery

Abolitionism

Abolitionism is a movement to end slavery.In western Europe and the Americas abolitionism was a movement to end the slave trade and set slaves free. At the behest of Dominican priest Bartolomé de las Casas who was shocked at the treatment of natives in the New World, Spain enacted the first...

 Free-Staters and pro-slavery "Border Ruffian

Border Ruffian

In the decade leading up to the American Civil War, pro-slavery activists infiltrated Kansas Territory from the neighboring slave state of Missouri. To abolitionists and other Free-Staters, who desired Kansas to be admitted to the Union as a free state, they were collectively known as Border...

" elements, that took place in the Kansas Territory

Kansas Territory

The Territory of Kansas was an organized incorporated territory of the United States that existed from May 30, 1854, until January 29, 1861, when the eastern portion of the territory was admitted to the Union as the State of Kansas....

 and the western frontier towns of the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Missouri

Missouri

Missouri is a US state located in the Midwestern United States, bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska. With a 2010 population of 5,988,927, Missouri is the 18th most populous state in the nation and the fifth most populous in the Midwest. It...

 roughly between 1854 and 1858. At the heart of the conflict was the question of whether Kansas

Kansas

Kansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...

 would enter the Union as a free state or slave state

Slave state

In the United States of America prior to the American Civil War, a slave state was a U.S. state in which slavery was legal, whereas a free state was one in which slavery was either prohibited from its entry into the Union or eliminated over time...

. As such, Bleeding Kansas was a proxy war

Proxy war

A proxy war or proxy warfare is a war that results when opposing powers use third parties as substitutes for fighting each other directly. While powers have sometimes used governments as proxies, violent non-state actors, mercenaries, or other third parties are more often employed...

 between Northerners

Northern United States

Northern United States, also sometimes the North, may refer to:* A particular grouping of states or regions of the United States of America. The United States Census Bureau divides some of the northernmost United States into the Midwest Region and the Northeast Region...

 and Southerners

Southern United States

The Southern United States—commonly referred to as the American South, Dixie, or simply the South—constitutes a large distinctive area in the southeastern and south-central United States...

 over the issue of slavery in the United States.