Road to Disunion Lecture Slides
AP U.S. History Lecture
Period 4 & 5 Causation & CCOT
The Path to Sectional Rupture
ROAD TO DISUNION
Constitutional, Economic, and Political Fractures Leading to the American Civil War (1833–1861)
Focus Topics: Tariff of 1833 • Comp. of 1850 • Dred Scott • Buchanan • Secession
Slide 1 of 8
I. Precedents of State Defiance
Compromise Tariff of 1833
AP Key Concept 4.3.II.C Historical Skill: CCOT
Nullification & Sovereign Protest
- Tariff of Abominations: High protective duties injured South Carolina's export economy, triggering state-led constitutional defiance.
- Nullification Ordinance: Under John C. Calhoun, SC declared the tariffs null and void, asserting state veto power over federal laws.
- Force Bill: President Andrew Jackson denounced nullification as treason, securing authority to deploy federal troops to enforce compliance.
The Compromise & Sectional Legacy
- Henry Clay's Savior Role: Structured a gradual compromise tariff over 10 years, resolving the military standoff.
- Constitutional Continuity: Entrenched the dangerous legal framework of state-level nullification and defense of local economic systems.
- Takeaway: Southern elites realized single-state action failed; future defense of slavery would require unified regional secession.
AP Thinking Prompt: How did Jackson's 1833 executive actions establish a precedent for federal power over regional revolt?
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II. Post-Mexican War Territorial Crises
The Compromise of 1850
AP Key Concept 5.2.II.A Historical Skill: Causation
The Catalyst
The Mexican Cession (1848) reopened sectional wounds. California's gold rush led to a free-state application, breaking the equal balance of Senate representation.
Clay's Legislative Package
Concessions to the North
- California admitted as a free state.
- Slave trade abolished in Washington, D.C.
Concessions to the South
- Fugitive Slave Act: High-penalty federal capture system.
- Texas Border settled: Debt assumed by US government.
Popular Sovereignty in New Lands
Citizens of New Mexico and Utah territories would vote on slavery, repealing physical latitude boundaries and leaving future expansion highly volatile.
AP Analysis: Explain how the Fugitive Slave Act nationalized the institutional enforcement of slavery.
Slide 3 of 8
III. Abolitionist Resistance & Sectional Radicalization
Primary Source Analysis
AP Key Concept 5.2.II.B Historical Skill: CCOT
Boston Abolitionist Handbill (April 1851)
"CAUTION!! COLORED PEOPLE OF BOSTON... avoid conversing with the Watchmen and Police Officers of Boston... they are empowered to act as KIDNAPPERS and Slave Catchers..."
— Theodore Parker, Abolitionist Leader
The Northern Transformation
- Personal Liberty Laws: Passed by Northern legislatures trying to nullify/obstruct the federal enforcement of runaway slave captures.
- Radicalizing the North: Ordinary citizens became complicit in capturing humans, forcing moderate Northerners to take sides.
- Southern Backlash: Southern states interpreted Northern municipal nullification as a hostile breach of the 1850 federal pact.
AP Practice: How does this source reflect changing attitudes towards Federal vs. State authority?
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IV. Judicial Ruptures
Dred Scott v. Sandford (1857)
AP Key Concept 5.2.II.C Historical Skill: Causation
The Supreme Court's Ruling
- Denial of Citizenship: Black people were not citizens under the Constitution and had "no rights which white men were bound to respect."
- Slavery Protected Nationally: Enslaved people were legal property. The 5th Amendment protects property from federal seizure.
- Compromise Declared Void: Ruled Congress had no authority to restrict slavery in federal territories, rendering the Missouri Compromise void.
The Political Backlash
- Popular Sovereignty Destroyed: If Congress could not restrict slavery, territorial legislatures could not either. This broke the platform of Northern Democrats.
- The "Slave Power" Conspiracy: Confirmed Northern fears that a Southern slaveholding cabal controlled the executive and judiciary.
- Southern Constitutional Shield: Provided South with a powerful, permanent legal shield to demand national protection of slavery.
AP Analysis: Explain how the Dred Scott decision essentially legalized slavery on a nationwide scale.
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V. Executive Failure & Political Fracture
The Presidency of James Buchanan
AP Key Concept 5.2.II Historical Skill: Causation
Lecompton Constitution
Buchanan supported the heavily contested pro-slavery Kansas constitution, ignoring widespread voter fraud.
Splits the Democratic Party between North & South.
Panic of 1857
An economic panic damaged Northern business while Southern cotton remained insulated, creating false confidence.
South believes Cotton is invulnerable and self-sustaining.
Lame Duck Paralysis
When Southern states seceded after Lincoln's victory, Buchanan did nothing, claiming no authority to stop them.
Allows the Confederacy to organize and seize forts.
AP Critical Thinking: How did executive inaction during the "Lame Duck" period directly contribute to the outbreak of war?
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VI. The Final Catalyst
The Election of 1860 & Secession
AP Key Concept 5.2.II.D Historical Skill: Causation
A Sectional Election
- Divided Democrats: Northern Democrats nominated Douglas, Southern Democrats nominated Breckinridge, fracturing the national vote.
- Republican Triumph: Abraham Lincoln won the election with an exclusively Northern base, taking 180 electoral votes.
- Zero Southern Support: Lincoln did not carry a single slave state, demonstrating to the South they were politically powerless.
The Secession Cascade
On December 20, 1860, South Carolina seceded. By February 1861, MS, FL, AL, GA, LA, and TX followed, forming the Confederacy.
"We, therefore, the People of South Carolina... declare that the Union now subsisting between South Carolina and other States... is hereby dissolved."
AP Critical Thinking: Was Lincoln's election the primary cause of secession, or simply the spark for a long-burning crisis?
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Synthesizing Period 4 & 5
APUSH Analytical Workshop
FRQ / DBQ Prep Historical Skills: Causation & CCOT
Workshop 1: Causation
Evaluate the Breakdown of Compromise
Compare the success of the Compromise Tariff of 1833 to the short-lived Compromise of 1850.
Key Analytical Tasks:
- Define the changing role of moral arguments in congressional debates.
- Contrast how territorial gain (Mexican Cession) altered the stakes.
Workshop 2: CCOT
Analyze Southern Constitutional Defense
Trace how Southern constitutional strategies to preserve and expand slavery evolved from 1833 to the 1857 Dred Scott decision.
Key Analytical Tasks:
- Identify the continuous reliance on states' rights rhetoric.
- Assess the dramatic shift from defensive nullification to aggressive federal protection of slavery as property.
Self-Reflection: Formulate a thesis statement addressing either prompt before the next lecture session.
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