8 Slavery and Sectional Conflict
Trace how slavery expanded, how enslaved people and antislavery activists resisted it, and how disputes over its expansion led to secession, civil war, and emancipation.
’s expansion
denied enslaved people legal freedom and control over their lives. After the United States ended the legal importation of enslaved people from abroad in 1808, continued to grow through the birth of enslaved children and the .
The cotton gin made short-staple cotton more profitable to process, encouraging plantation agriculture to spread across the Deep South. Enslavers forcibly sold and transported hundreds of thousands of people from the Upper South to expanding cotton and sugar regions. By 1860, nearly four million people were enslaved in the United States.
Enslaved people worked not only on cotton plantations but also in tobacco, rice, sugar, and other agriculture, as well as in homes, workshops, and cities. generated wealth for enslavers and connected to national and international commerce. Its growth intensified disputes about whether it would be allowed in western territories and new states.
Resistance to
Enslaved people resisted in many ways. Everyday acts included slowing work, preserving family and cultural traditions, learning despite restrictions, negotiating for autonomy, and escaping. Some also resisted through armed rebellion. Nat Turner’s 1831 revolt in Virginia was followed by harsher restrictions on enslaved and free Black people.
Escape was another persistent form of resistance. Some freedom seekers fled on their own; others received help through networks later known as the . The Fugitive Slave Act of 1850 made escape more perilous by strengthening federal efforts to capture and return people who had fled .
Antislavery activism
Black activists were central to antislavery work. Frederick Douglass, who escaped , became a prominent speaker, writer, and newspaper editor. Harriet Tubman repeatedly risked capture to help people escape.
Black and white abolitionists organized societies, circulated pamphlets and newspapers, petitioned government, gave speeches, and challenged through civil disobedience. In 1833, activists formed the American Anti- Society and called for immediate emancipation. Abolitionists did not all agree on strategy: some emphasized moral persuasion and nonviolence, while others supported political action or resistance. Their efforts helped make a national controversy and provoked fierce opposition from enslavers and their allies.
Not every opponent of was an . Many advocates opposed ’s expansion into western territories without demanding its immediate abolition where it already existed. This distinction shaped political debates over the future of the West.
Compromises over western expansion
As the nation expanded, each new territory raised the question of whether could spread there. The admitted Missouri as a slave state and Maine as a free state in 1820, while prohibiting in much of the remaining Louisiana Purchase north of latitude . It temporarily eased conflict but did not resolve the underlying dispute.
The Mexican-American War, fought from 1846 to 1848, added vast western lands to the United States and revived arguments over ’s expansion. The admitted California as a free state and left the status of in Utah and New Mexico to be decided locally. It ended the slave trade—but not —in Washington, D.C., and strengthened the Fugitive Slave Act. The law required greater federal involvement in returning freedom seekers and drew resistance from many Northerners.
Conflict deepens
In 1854, the opened Kansas and Nebraska to , the idea that settlers would decide whether was allowed. The act effectively repealed the ’s restriction north of latitude . Proslavery and antislavery settlers rushed into Kansas, where election fraud and armed clashes gave the territory the name “Bleeding Kansas.” The violence showed that local voting could intensify rather than settle the conflict.
In 1857, the Supreme Court’s decision ruled that Black people of African descent could not be U.S. citizens and that Congress lacked authority to prohibit in the territories. Many Northerners condemned the ruling; slaveholders and their supporters welcomed it.
In 1859, John Brown’s raid on the federal arsenal at Harpers Ferry, Virginia, aimed to encourage an uprising against . Brown was captured and executed. The raid heightened Southern fears of antislavery violence and further polarized public opinion.
and the Civil War
By the late 1850s, national political parties were fracturing over . The newly formed Republican Party opposed ’s extension into the territories. Abraham Lincoln won the presidency in 1860 without carrying the Deep South. He had pledged to prevent ’s expansion, not to abolish it immediately where it already existed. Southern secessionists nevertheless saw his election as a threat to ’s future and political power.
Beginning with South Carolina in December 1860, eleven states seceded and formed the Confederate States of America. Their documents identified the defense of as a central purpose. The Union and Confederacy went to war in April 1861 when Confederate forces attacked Fort Sumter. was the immediate crisis, but the core sectional conflict that produced it was , especially whether would be protected and expanded.
Emancipation and abolition
The Civil War changed the conflict over . Enslaved people fled to Union lines and claimed freedom for themselves, while the federal government increasingly struck at as a means of weakening the Confederacy.
The , effective January 1, 1863, declared enslaved people free in areas still in rebellion. It did not end everywhere. The , ratified in 1865, abolished throughout the United States.