The Kansas-Nebraska Act intensified sectionalism in the United States by reopening the national debate over slavery, weakening the political compromises that had kept tensions between the North and South under control, and turning the territory of Kansas into a violent testing ground. On top of that, passed by Congress in 1854, the act organized two new territories and claimed to give their settlers the right to decide for themselves whether to permit slavery. In practice, the measure encouraged conflict between proslavery and antislavery forces, helped create the Republican Party, and moved the country closer to the Civil War.
The Slavery Question Before 1854
Sectionalism refers to the growing political, economic, and social division between the free-soil North and the slaveholding South. Southern states depended on enslaved labor to produce cash crops such as cotton, sugar, tobacco, and rice. By the 1850s, the two regions differed in important ways. Northern states had developed a diverse economy based on farms, factories, commerce, and wage labor.
The question of whether slavery should expand into new territories therefore had consequences far beyond the territories themselves. Each new slave state would gain representation in both houses of Congress and, under the law then in effect, equal representation in the Senate. The South feared that the admission of additional free states would eventually give the North enough votes in Congress to override protections for slavery. Antislavery Northerners worried that the expansion of slaveholding power would weaken opportunities for free labor and threaten the political influence of their own region Surprisingly effective..
For many years, Congress had managed these disputes through compromise. When the Mexican-American War ended in 1848, however, the United States acquired vast new lands. The Missouri Compromise of 1820 prohibited slavery in the remainder of the Louisiana Purchase territory north of latitude 36°30′, except for Missouri. The Missouri Compromise line now ran through territories that had not yet been organized, creating another major sectional dispute.
What the Kansas-Nebraska Act Did
The Kansas-Nebraska Act, sponsored by Democratic Senator Stephen A. Douglas of Illinois, divided the remaining unorganized territory acquired after the Mexican-American War into two separate jurisdictions:
- The Territory of Kansas
- The Territory of Nebraska
The act also introduced the principle of popular sovereignty, sometimes called “squatter sovereignty.” Under this system, residents of each territory would decide through a referendum whether their state constitution should allow or prohibit slavery. Congress did not immediately tell the territories what their final decision would be.
Counterintuitive, but true.
At the same time, the measure effectively repealed the Missouri Compromise. Critics, however, pointed out that the decision would not be made in a peaceful or well-organized political environment. Rather than remaining permanently free under the 36°30′ boundary, the territories of Kansas and Nebraska became subject to the votes of their settlers. Douglas argued that popular sovereignty was a democratic solution that respected the will of local residents. Violence, intimidation, disputed elections, and competing governments could all influence the outcome.
The timing was especially dangerous in Kansas. Slaveholding interests wanted the territory to become a slave state,
