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Wilmot Proviso, introduced by Congressman David Wilmot, proposed banning slavery in any territory acquired fromM during the Mexican-American War. Although it failed in Congress, it intensified sectional conflict by highlighting the debate over slavery's expansion. Southern leaders saw it as a direct threat to their way of life, while Northern abolitionists supported it as a moral issue. This debate foreshadowed the national divide over slavery. (Varon, 103)
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Part of theCompromise of 1850, the Fugitive Slave Act mandated that escaped slaves be returned to their owners, even if they reached free states. This law angered many Northerners, leading to widespread resistance, including violent confrontations like the rescue of Shadrach Minkins. The law forced many in the North to confront the reality of slavery, increasing support for the abolitionist movement and heightening tensions with the South. (Varon, 175)
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The Compromise of 1850 was a series of laws designed to address the sectional crisis caused by the expansion of slavery into new territories. It admitted California as a free state, allowed territories to decide slavery (popular sovereignty), and strengthened the Fugitive Slave Act. While it temporarily eases tensions, it only deepened the divide by making the enforcement of slavery more pronounced in the North, fueling abolitionist sentiment. (McPherson, 55)
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Harriet Beecher Stowe's "Uncle Tom's Cabin" depicted the harsh realities of slavery and became and immediate bestseller, galvanizing Northern abolitionist sentiment. Its portrayal of slavery as a moral wrong helped transform the issue into a national moral crisis. The book increased tensions between North and South, with Southerners denouncing it as a propaganda tool. Stowe's novel helped shape public opinion on slavery in the years leading up to the Civil War. (McPherson, 63)
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The Ostend Manifesto was a confidential document advocating for the United States to seize Cuba, claiming it was necessary for the expansion of slavery. It alarmed Northerners, who feared the South was seeking to expand slavery into new territories. The manifesto reflected the growing Southern desire or expansion and was a precursor to the sectional tensions that would soon erupt. It showcased the South's push to extend its political power through territory. (Varon, 227)
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The Kansas-Nebraska Act, proposed by Stephen A. Douglas, allowed settlers in Kansas and Nebraska to decide for themselves whether to allow slavery, effectively repealing the Missouri Compromise. The Act led to violent conflicts in Kansas between pro-slavery and anti-slavery settlers, known as "Bleeding Kansas." This conflict marked the breakdown of political compromise and deepened the national divide, signaling the failure of popular sovereignty as a solution to slavery. (McPherson, 99)
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In May, 1856, Senator Charles Sumner of Massachusetts was brutally attacked by Congressman Preston Brooks of South Carolina on the Senate floor. Sumner had delivered a speech denouncing the Kansas-Nebraska Act and condemning slavery, which deeply offended Brooks. The caning of Sumner symbolized the breakdown of civil discourse in Congress and escalated tensions between the North and South. It showed how deeply divided the nation had become over the issue of slavery. (McPherson, 120)
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In the Dred Scott v Sandford case, the Supreme Court ruled that African Americans could not be citizens and that Congress had no authority to prohibit slavery in the U.S. territories. The decision invalidated the Missouri Compromise and further polarized the nation. It enraged abolitionists who saw it as a grave injustice, and emboldened pro-slavery advocates, signaling that the federal government would not intervene to limit slavery. (McPherson, 132)
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In the Lincoln-Douglas debates, Abraham Lincoln and Stephen A. Douglas clashed over the future of slavery in America. While Douglas advocated for popular sovereignty, Lincoln argued that slavery was a moral issue and should not be allowed to expand. Though Douglas won the Senate seat, Lincoln's performance earned him national recognition, making him the Republican Party's presidential candidate in 1860. The debates highlighted the deepening sectional divide over slavery. (McPherson, 152)
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John Brown, an abolitionist, led a raid on the federal arsenal at Harpers Ferry, Virginia, hoping to incite a slave revolt. The raid failed, and Brown was captured and executed. However, it inflamed Southern fears of Northern aggression and led to calls for secession. For Northerners, Brown became a martyr for the abolitionist cause, demonstrating the lengths to which some would go to end slavery, which escalated the national tensions that led to the war. (Varon, 275)
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