What major event in American history resulted in the divided opinions on slavery among politicians and led to the intensification of regional conflicts prior to the Civil War?

The major event in American history that resulted in divided opinions on slavery among politicians and intensified regional conflicts prior to the Civil War was the passage of the Kansas-Nebraska Act in 1854.

To understand why this event had such profound implications, we need to go back to the context of the time. During this period, the United States was deeply divided over the issue of slavery. The country had already witnessed several compromises in an attempt to maintain a delicate balance between free and slave states, such as the Missouri Compromise in 1820 and the Compromise of 1850.

The Kansas-Nebraska Act, proposed by Democratic Senator Stephen Douglas, aimed to organize the western territories of Kansas and Nebraska, which lacked formal territorial governments. However, the act contained a provision that pushed the boundaries of controversy: it repealed the Missouri Compromise's restriction on slavery in territories north of the 36°30' parallel (the line that had previously divided free and slave states). This meant that these territories, which had been designated as free under the Missouri Compromise, would now decide the issue of slavery through popular sovereignty.

The act's passage led to a series of consequences that intensified regional tensions. Firstly, it shattered the delicate balance between free and slave states, reopening the possibility of slavery expanding into previously forbidden territories. This upset Northern abolitionists who saw slavery as a moral wrong and feared its expansion. At the same time, it emboldened pro-slavery interests in the South who hoped to establish more slaveholding states.

Secondly, the Kansas-Nebraska Act ignited a race for control over the newly opened territories. Both pro-slavery and anti-slavery settlers rushed into Kansas to influence the outcome of the popular sovereignty vote. This resulted in violent conflicts, voter fraud, and even armed confrontations between pro-slavery and anti-slavery factions, earning Kansas the moniker "Bleeding Kansas."

The events in Kansas further polarized the nation, drawing attention and passionate responses from politicians and the public alike. The rise of new political parties, such as the Republican Party that formed in opposition to the Kansas-Nebraska Act, reflected this growing sectional divide.

In conclusion, the passage of the Kansas-Nebraska Act in 1854, with its repeal of the Missouri Compromise and introduction of popular sovereignty, deepened the divide on slavery among politicians and intensified regional conflicts. It set in motion a chain of events that ultimately led to the outbreak of the Civil War in 1861.

The major event in American history that resulted in the divided opinions on slavery among politicians and led to the intensification of regional conflicts prior to the Civil War was the passage of the Kansas-Nebraska Act in 1854. Here are the steps that led to this event:

1. The Missouri Compromise of 1820: This legislation allowed for the admission of Missouri as a slave state and Maine as a free state, while also establishing a line at the southern border of Missouri (36°30'N). This line designated that future states located above it would be free states, while those below it could be slave states.

2. Annexation of Texas: In 1845, Texas was annexed to the United States as a slave state, which further intensified the debate over the expansion of slavery into new territories.

3. Wilmot Proviso: In 1846, Representative David Wilmot proposed a proviso that would have banned slavery in any territory acquired from Mexico as a result of the Mexican-American War. The proviso passed in the House but failed to become law due to opposition in the Senate, yet it further deepened the divide between the North and the South.

4. Compromise of 1850: This compromise was a series of legislative measures intended to appease both the North and the South. It admitted California as a free state, established popular sovereignty in the territories, and enacted a stricter fugitive slave law. While the compromise temporarily eased tensions, it also revealed the growing divide between the North and the South on the issue of slavery.

5. Dred Scott Decision: In 1857, the Supreme Court ruled in the Dred Scott case that African Americans, whether enslaved or free, were not citizens and could not sue in federal court. Additionally, the Court declared that Congress could not prohibit slavery in the territories. This decision further polarized the nation and contributed to the divisions surrounding slavery.

6. Passage of the Kansas-Nebraska Act: In 1854, Senator Stephen A. Douglas introduced the Kansas-Nebraska Act, which repealed the Missouri Compromise line and allowed for popular sovereignty in the territories of Kansas and Nebraska. This meant that the residents of these territories would decide whether to allow slavery through a popular vote. The act ignited a fierce struggle between pro-slavery and anti-slavery groups, leading to violent conflicts like "Bleeding Kansas."

Overall, the passage of the Kansas-Nebraska Act shattered the delicate balance between free and slave states and further deepened the sectional conflict, ultimately contributing to the onset of the Civil War.