Question: What was the conflict in the strife of the series of violent political confrontations in the US state having Great Bend High School?

full_context: Document 1: North Bend School District: North Bend School District (13) is a public school district that serves the city of North Bend, Oregon, United States. It came to national attention in 2018, when the Oregon Department of Education's report found that LGBT high school students in the district were subjected to systematic harassment and given the Bible to read as punishment.
Document 2: American Civil War: The American Civil War (commonly known as the Civil War in the United States) was fought in the United States from 1861 to 1865. The result of a long - standing controversy over slavery, war broke out in April 1861, when Confederates attacked Fort Sumter in South Carolina, shortly after President Abraham Lincoln was inaugurated. The nationalists of the Union proclaimed loyalty to the U.S. Constitution. They faced secessionists of the Confederate States of America, who advocated for states' rights to travel with slave attendants in the Americas or abolished tariffs on cotton and imports.
Document 3: Great Bend High School: Great Bend High School is a public high school located in Great Bend, Kansas, serving students in grades 9-12. The school is in the Unified School District 428. The athletic teams are known as the Panthers and all athletic programs compete in the 5A division according to the KSHSAA.
Document 4: Old Bend High School: The Old Bend High School is a historic school building in Bend, Oregon, in the United States. Opened in 1925, the building served as a public high school for 31 years and a junior high school for an additional 22 years before being transitioned in 1979 into its current role as the administrative headquarters for the Bend-La Pine School District.
Document 5: Kansas Legislature: During Kansas' first elections for a territorial government on March 30, 1855, nearly 5,000 Missouri men, led by United States Senator David Rice Atchison and other prominent pro-slavery Missourians, entered the territory, took over the polling places, and elected pro-slavery candidates. The elections resulted in 13 pro-slavery members of the upper house of the territorial legislature and one free - state member, who resigned. The lower house ended up with 25 pro-slavery members and one free - state member. Free - Staters immediately cried foul, naming the new Kansas Territorial Legislature the Bogus Legislature. After meeting for one week in Pawnee at the direction of Territorial Governor Andrew Reeder, the thirty - eight pro-slavery legislators reconvened at the Shawnee Manual Labor School between July 16 and August 30, 1855, and began crafting over a thousand pages of laws aimed at making Kansas a slave state.
Document 6: Madison High School (Kansas): Madison High School is a fully accredited public high school located in Madison, Kansas, in the Madison-Virgil USD 386 school district, serving students in grades 7-12. Madison has an enrollment of approximately 126 students. The principal is Stu Moeckel. The school mascot is the Bulldogs and the school colors are black and gold.
Document 7: Gering High School: Gering High School (GHS) is the only high school in Gering, Nebraska, United States. It is located at 1500 U Street. It has an enrollment of over 625 students, with a student to teacher ratio of 18:1. GHS offers a full range of academic courses as well as art, journalism and music programs. Many extracurricular after-school clubs and sports programs are available. The school was the first in the district to use block scheduling, the practice of having four one-and-a-half-hour classes that alternate every other day. In 2007 the Freshmen Academy was created to provide a transition for junior high students to high school. The Freshmen Academy mimics the high school block schedule, while maintaining a smaller more cohesive environment for the freshmen students.
Document 8: Kansas–Nebraska Act: The Kansas -- Nebraska Act divided the nation and pointed it toward civil war. The Act itself virtually nullified the Missouri Compromise of 1820. The turmoil over the act split both the Democratic and Whig parties and gave rise to the Republican Party, which split the United States into two major political camps, the Republican North and the Democratic South.
Document 9: American Civil War: The American Civil War (also known by other names) was a war fought in the United States from 1861 to 1865. As a result of the long - standing controversy over slavery, war broke out in April 1861, when Confederate forces attacked Fort Sumter in South Carolina, shortly after U.S. President Abraham Lincoln was inaugurated. The nationalists of the Union proclaimed loyalty to the U.S. Constitution. They faced secessionists of the Confederate States, who advocated for states' rights to expand slavery.
Document 10: Great Bend, Kansas: Great Bend is a city in and the county seat of Barton County, Kansas, United States. It is named for its location at the point where the course of the Arkansas River bends east then southeast. As of the 2010 census, the population of the city was 15,995.
Document 11: Amphitheater High School: Amphitheater High School, also known as Amphi High, is a public high school, located in central Tucson, Arizona, United States. Amphi is the flagship high school of Amphitheater Public Schools of Tucson, and serves grades 9–12. The school mascot is the panther, and the school colors are kelly green and white. Amphi opened in 1939 as the second high school in Tucson, and has a student enrollment of 1,249. In the 1983-84 school year, it was honored as a Blue Ribbon school.
Document 12: Military history of the United States: Sectional tensions had long existed between the states located north of the Mason–Dixon line and those south of it, primarily centered on the "peculiar institution" of slavery and the ability of states to overrule the decisions of the national government. During the 1840s and 1850s, conflicts between the two sides became progressively more violent. After the election of Abraham Lincoln in 1860 (who southerners thought would work to end slavery) states in the South seceded from the United States, beginning with South Carolina in late 1860. On April 12, 1861, forces of the South (known as the Confederate States of America or simply the Confederacy) opened fire on Fort Sumter, whose garrison was loyal to the Union.
Document 13: Bleeding Kansas: Through the Missouri Compromise of 1820, Congress kept a tenuous balance of political power between North and South. In May 1854, the Kansas -- Nebraska Act, created from unorganized Indian lands and territories of Kansas and Nebraska, permitted residency by U.S. citizens, who were to determine their state's slavery status and seek admission to the Union. Immigrants supporting both sides of the question arrived in Kansas to establish residency and gain the right to vote. However, Kansas Territory officials were appointed (1854) by the pro-slavery administration of President Franklin Pierce (in office 1853 -- 1857), and thousands of non-resident pro-slavery Missourians entered Kansas with the goal of winning elections. They captured territorial elections, sometimes by fraud and intimidation. In response, Northern abolitionist elements flooded Kansas with ``free - soilers. ''Anti-slavery Kansas residents wrote the first Kansas Constitution (1855) and elected the Free State legislature in Topeka; this stood in opposition to the pro-slavery government in Lecompton. The two Territorial governments increased as well as symbolized the strife of Bleeding Kansas.
Document 14: Bleeding Kansas: Bleeding Kansas, Bloody Kansas or the Border War was a series of violent political confrontations in the United States between 1854 and 1861 involving anti-slavery ``Free - Staters ''and pro-slavery`` Border Ruffian'', or ``southern ''elements in Kansas. At the heart of the conflict was the question of whether Kansas would allow or outlaw slavery, and thus enter the Union as a slave state or a free state. The Kansas -- Nebraska Act of 1854 called for`` popular sovereignty'' -- that is, the decision about slavery was to be made by the settlers (rather than outsiders). It would be decided by votes -- or more exactly which side had more votes counted by officials. Pro-slavery forces said every settler had the right to bring his own property, including slaves, into the territory. Anti-slavery ``free soil ''forces said the rich slaveholders would buy up all the good farmland and work it with black slaves, leaving little or no opportunity for non-slaveholders. As such, Bleeding Kansas was a conflict between anti-slavery forces in the North and pro-slavery forces from the South over the issue of slavery in the United States, and its violence indicated that compromise was unlikely, and thus it presaged the Civil War.
Document 15: Southern California: Subsequently, Californios (dissatisfied with inequitable taxes and land laws) and pro-slavery southerners in the lightly populated "Cow Counties" of southern California attempted three times in the 1850s to achieve a separate statehood or territorial status separate from Northern California. The last attempt, the Pico Act of 1859, was passed by the California State Legislature and signed by the State governor John B. Weller. It was approved overwhelmingly by nearly 75% of voters in the proposed Territory of Colorado. This territory was to include all the counties up to the then much larger Tulare County (that included what is now Kings, most of Kern, and part of Inyo counties) and San Luis Obispo County. The proposal was sent to Washington, D.C. with a strong advocate in Senator Milton Latham. However, the secession crisis following the election of Abraham Lincoln in 1860 led to the proposal never coming to a vote.
ground_truth: anti-slavery ``Free - Staters ''and pro-slavery`` Border Ruffian'', or ``southern ''elements
sub_queries: What state is Great Bend High School located? Answer: Kansas
who was the conflict between in the strife of bleeding Kansas Answer: anti-slavery ``Free - Staters ''and pro-slavery`` Border Ruffian'', or ``southern ''elements