The Kansas Nebraska act further deepened the divide between the North and South , fueling increased tension and conflict between pro-slavery and anti-slavery factions. The resulting conflict in Kansas, known as "Bleeding Kansas," marked by clashes between pro and antislavery settlers, only intensified the divisions between the two regions and brought the country to the brink of civil war . It also led to the rise of the Republican Party, predominantly composed of anti-slavery activists who opposed the extension of slavery into new territories. The party's eventual dominance in the North ultimately contributed to the election of Abraham Lincoln as president in 1860 and the subsequent outbreak of the civil war in the following year .
In conclusion , the Kansas Nebraska act had a profound and destabilizing impact on sectional harmony in the United States . By repealing the Missouri Compromise and introducing the principle of popular sovereignty, it reignited the debate over the expansion of slavery and deepened the divisions between the North and south . The conflict that followed in Kansas further escalated tensions, leading to the civil war and the reshaping of the nation's political landscape