The Slavery Debate

APUSH NOTES

Sectional Crisis & Road to the Civil War (1815–1861)

I. Big Picture (Thesis-Level)

Between the War of 1812 and the Civil War, sectionalism intensified as compromises failed to reconcile slavery, states’ rights, and political power. Temporary agreements delayed conflict, but westward expansion and federal decisions ultimately made war unavoidable.

II. Henry Clay – “The Great Compromiser”

Who he was

  • Kentucky statesman

  • Nationalist → prioritized preserving the Union

  • Crafted compromises to delay sectional conflict

Major compromises

  1. Missouri Compromise (1820–1821)

  2. Compromise Tariff of 1833

  3. Compromise of 1850

III. Missouri Compromise (1820)

Problem

  • Missouri applied as a slave state

  • Would upset Senate balance (11 free / 11 slave)

Terms

  • Missouri → slave state

  • Maine → free state

  • Slavery banned north of 36°30′ in Louisiana Purchase

Significance

  • Temporarily preserved balance

  • Established Congress could regulate slavery

  • Later overturned by Dred Scott (1857)

IV. Tariff Crisis & Compromise Tariff of 1833

Tariff of Abominations (1828)

  • Protected Northern industry

  • Hurt Southern economy

  • Raised prices on manufactured goods

Southern response

  • South Carolina nullification

  • Led by John C. Calhoun

  • Claimed states could reject federal laws

Resolution

  • Clay’s Compromise Tariff:

    • Gradual tariff reduction over 9 years

  • Jackson preserved federal authority

Significance

  • Foreshadowed states’ rights vs federal power

  • Preview of secession logic

V. Compromise of 1850

Trigger

  • Mexican Cession raised slavery question again

  • California sought admission as free state

Key provisions

  • California → free state

  • New Mexico & Utah → popular sovereignty

  • Slave trade banned in D.C.

  • Stronger Fugitive Slave Act

  • Texas debt assumed by federal government

Impact

  • Appeased both sides short-term

  • Fugitive Slave Act radicalized the North

  • Accelerated abolitionism

VI. Fugitive Slave Act of 1850 (VERY IMPORTANT)

What it did

  • Forced all Americans to help enforce slavery

  • No jury trial for accused fugitives

  • Federal commissioners paid more to return slaves

  • Heavy penalties for resistance

Northern reaction

  • Personal liberty laws

  • Riots & rescues (e.g., Anthony Burns)

  • Expansion of Underground Railroad

Significance

  • Turned moderates into abolitionists

  • Made slavery a national issue

  • Deepened sectional hostility

VII. Northern vs Southern Attitudes

North

  • Abolitionists → moral opposition

  • Free-Soilers → opposed slavery’s expansion

  • Feared Slave Power Conspiracy

  • Supported free labor & economic opportunity

South

  • Feared Northern abolitionism

  • Slavery central to economy & identity

  • Needed Senate balance to protect slavery

  • Increasingly defensive and militant

VIII. Wilmot Proviso (1846)

Proposal

  • Ban slavery in all Mexican-War territories

Outcome

  • Passed House

  • Failed Senate

Significance

  • Split national parties

  • Led to Free-Soil Party

  • Raised constitutional issues over slavery

IX. Kansas–Nebraska Act (1854)

Authored by

  • Stephen A. Douglas

Key provisions

  • Repealed Missouri Compromise

  • Introduced popular sovereignty

Consequences

  • Collapse of Whig Party

  • Formation of Republican Party

  • Violence → Bleeding Kansas

X. Bleeding Kansas (1855–1856)

What happened

  • Pro-slavery Missourians voted illegally

  • Rival governments formed

  • Violence between Free-Soilers and pro-slavery forces

  • John Brown’s Pottawatomie Massacre

Significance

  • Showed popular sovereignty failed

  • Preview of Civil War violence

XI. Dred Scott v. Sandford (1857)

Supreme Court ruling

  • Black people not citizens

  • Slavery = protected property

  • Congress cannot ban slavery

  • Missouri Compromise unconstitutional

Impact

  • Invalidated popular sovereignty

  • Confirmed Northern fears of Slave Power

  • Strengthened Republican opposition

XII. Lincoln–Douglas Debates (1858)

Issues debated

  • Free soil vs popular sovereignty

  • Expansion of slavery

  • Constitutional authority

Outcome

  • Douglas won Senate seat

  • Lincoln gained national prominence

XIII. John Brown & Harpers Ferry (1859)

Event

  • Raid on federal arsenal

  • Intended to spark slave uprising

Outcome

  • Raid failed

  • Brown executed

Impact

  • Northern martyr

  • Southern terror

  • Violence normalized

XIV. Abolitionist Movement

Key figures

  • William Lloyd Garrison – moral absolutist, The Liberator

  • Frederick Douglass – political abolition, Black citizenship

  • Sojourner Truth – abolition + women’s rights

  • Harriet Tubman – Underground Railroad

  • John Brown – violent resistance

Methods

  • Newspapers

  • Speeches

  • Slave narratives

  • Underground Railroad

  • Political action

XV. Underground Railroad

Characteristics

  • Decentralized network

  • Mostly Black-led

  • Helped ~100,000 escape (1810–1850)

Importance

  • Active resistance to slavery

  • Direct defiance of federal law

XVI. Harriet Beecher Stowe – Uncle Tom’s Cabin (1852)

Impact

  • Humanized enslaved people

  • Sold over 1 million copies

  • Outraged the South

  • Strengthened abolitionism

XVII. Slave Narratives

Purpose

  • Show cruelty of slavery

  • Assert enslaved people’s humanity

Notable authors

  • Frederick Douglass

  • William Wells Brown

  • Sojourner Truth

XVIII. Exam-Ready Takeaway (One Sentence)

Repeated compromises delayed conflict but failed to resolve the fundamental contradiction between slavery and free labor, making sectional war inevitable by 1861.