How did sectional differences over slavery break the Union apart?
Explain the growth of sectionalism and the causes of the Civil War: the slavery debate, the failed compromises, key events (Dred Scott, Bleeding Kansas, John Brown), the election of 1860, and secession (Virginia 2015 History and Social Science SOL VUS.6, VUS.7).
A SOL-level answer on the causes of the Civil War for the VUS exam: the sectional divide between North and South over slavery and states' rights, the failed compromises, Dred Scott and Bleeding Kansas, the election of 1860, and the secession of Southern states including Virginia.
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What this topic is asking
Standards VUS.6 and VUS.7 ask how the nation split into hostile sections and why the Civil War came. The core cause was slavery, especially its expansion into the western territories, entangled with arguments over states' rights. The test wants the chain of failed compromises and inflaming events (the Compromise of 1850, the Kansas-Nebraska Act, Dred Scott, Bleeding Kansas, John Brown, the election of 1860) that led Southern states to secede, Virginia among them.
The two sections
The clash of these systems made every national question, tariffs, territory, federal power, a fight, but the issue underneath was always slavery.
The failed compromises
For decades, leaders tried to balance free and slave interests so the Union would hold:
- Missouri Compromise (1820): admitted Missouri (slave) and Maine (free) and drew a line across the Louisiana territory dividing future slave and free areas.
- Compromise of 1850: admitted California free but included a tough Fugitive Slave Act that outraged the North.
- Kansas-Nebraska Act (1854): let territories decide slavery by popular sovereignty, which voided the Missouri line and set off violent fighting in "Bleeding Kansas."
Each compromise bought time but deepened distrust.
The inflaming events
Several events pushed the sections toward war:
- Dred Scott v. Sandford (1857): the Supreme Court ruled that African Americans were not citizens and that Congress could not ban slavery in the territories. The North was furious: it implied slavery could spread anywhere.
- John Brown's raid on Harpers Ferry, Virginia (1859): the abolitionist John Brown tried to start a slave uprising by seizing a federal arsenal in Virginia. He failed and was executed, but the South saw it as proof the North wanted to destroy slavery by force.
Election of 1860 and secession
When Abraham Lincoln, the candidate of the new antislavery Republican Party, won the election of 1860 without carrying any Southern state, the South concluded its way of life was lost within the Union. South Carolina seceded first, followed by others. Virginia seceded after fighting began, and its capital, Richmond, became the Confederate capital, a fact central to the war's geography and to the Virginia emphasis.
Try this
Q1. State the main issue that divided the North and South before the Civil War. [1]
- Cue. Slavery, especially whether it could expand into the new western territories (tied to states' rights).
Q2. Explain why the Dred Scott decision (1857) angered the North. [2]
- Cue. It ruled African Americans were not citizens and that Congress could not ban slavery in the territories, implying slavery could spread anywhere and the government could not stop it.
Exam-style practice questions
Practice questions written in the style of VDOE exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
VA VUS SOL (released item style)1 marksWhat was the main issue dividing the North and the South in the decades before the Civil War?
(A) Tariffs on imported tea
(B) The future of slavery, especially in the new western territories
(C) The location of the national capital
(D) Whether to declare war on Britain
Show worked answer →
A single-select item on the central cause of the war (VUS.6, VUS.7).
Correct answer: (B). The deepest division was over slavery, above all whether it would spread into the new western territories, a question tied to states' rights and the balance of power in Congress.
A, C, and D were minor or unrelated. The test rewards naming slavery (and its expansion) as the central sectional issue.
VA VUS SOL (released item style)2 marksThe Supreme Court's decision in Dred Scott v. Sandford (1857) inflamed sectional tensions.
(a) State what the Court ruled about enslaved people and the territories. (b) Explain why the decision angered many Northerners.
Show worked answer →
A two-part stimulus item (VUS.7), 2 points (1 per part).
(a) 1 point: the Court ruled that African Americans were not citizens and could not sue, and that Congress had no power to ban slavery in the territories (striking down the Missouri Compromise line).
(b) 1 point: it angered Northerners because it meant slavery could spread into any territory and the federal government could not stop it, seeming to make the entire country open to slavery.
Markers reward the ruling (no citizenship; Congress cannot ban slavery in territories) and the Northern reaction.
Related dot points
- Explain westward expansion and Manifest Destiny, including the major acquisitions of territory, the Mexican-American War, the impact on American Indians, and how expansion intensified the conflict over slavery (Virginia 2015 History and Social Science SOL VUS.6).
A SOL-level answer on westward expansion for the VUS exam: the idea of Manifest Destiny, the major territorial acquisitions, the Mexican-American War and the lands it added, the displacement of American Indians, and how new western land reignited the fight over slavery.
- Describe the major events, leaders, and turning points of the Civil War, including the advantages of each side, Gettysburg and Vicksburg, key figures (Lincoln, Grant, Lee, Davis), and the war's end at Appomattox (Virginia 2015 History and Social Science SOL VUS.7).
A SOL-level answer on the Civil War for the VUS exam: the advantages of the Union and Confederacy, key leaders (Lincoln, Grant, Lee, Davis), the turning points at Gettysburg and Vicksburg in 1863, Virginia as the war's main eastern battleground, and the Confederate surrender at Appomattox in 1865.
- Explain the significance of the Emancipation Proclamation and the principles expressed in the Gettysburg Address, and how they reframed the purpose of the Civil War (Virginia 2015 History and Social Science SOL VUS.7).
A SOL-level answer on Lincoln's wartime words for the VUS exam: the Emancipation Proclamation (1863) and what it did and did not do, the principles of the Gettysburg Address, and how both reframed the Civil War as a struggle for freedom and a test of democratic government.
- Explain the goals and policies of Reconstruction, the Reconstruction Amendments (13th, 14th, 15th), the Freedmen's Bureau, and the political conflicts of the era (Virginia 2015 History and Social Science SOL VUS.7).
A SOL-level answer on Reconstruction for the VUS exam: the goals of rebuilding the South and integrating freed people, the 13th, 14th, and 15th Amendments, the Freedmen's Bureau, the conflict between President Johnson and Radical Republicans, and the gains African Americans made during Reconstruction.
- Describe the antebellum reform movements, including abolitionism, the women's rights movement (Seneca Falls), the Second Great Awakening, temperance, and education reform (Virginia 2015 History and Social Science SOL VUS.6).
A SOL-level answer on antebellum reform for the VUS exam: the Second Great Awakening, the abolitionist movement (Douglass, Garrison, Tubman), the women's rights movement and the Seneca Falls Convention, temperance, and education reform, with their lasting influence on American society.
Sources & how we know this
- Standards of Learning Documents for History and Social Science, Adopted 2015 — Virginia Department of Education (2015)
- SOL Practice Items (All Subjects) — Virginia Department of Education (2024)