APUSH Unit 5 Civil War Notes (1844–1877): Causes, Conflict, and Lived Experience

Election of 1860 and Secession

Why the Election of 1860 became a breaking point

By 1860, the United States had been arguing about slavery for decades, but the arguments weren’t just moral—they were also political and economic. The key change in the 1850s was that conflict over slavery shifted from being a recurring debate inside national institutions (Congress, parties, courts) into something that threatened the survival of those institutions. When established “rules of the game” stop working, political disputes can become constitutional crises.

The Election of 1860 mattered because it convinced many white Southerners that they had lost meaningful power in the federal government. Abraham Lincoln’s victory demonstrated a new reality: a president could be elected without winning a single Southern state, based on a coalition rooted in the North. In a system where the presidency controls federal appointments, the army and navy, and the enforcement of laws, that outcome felt existential to slaveholding interests.

A common misconception is that the election caused secession simply because Lincoln personally intended to abolish slavery immediately everywhere. Lincoln’s stated position in 1860 was that the federal government should stop the expansion of slavery into the western territories (a core Republican position), not that it could unilaterally end slavery in states where it already existed. What pushed secession wasn’t only what Lincoln promised to do on Day 1; it was what his election symbolized: a federal government now controlled by a party many Southerners saw as hostile to slavery’s long-term security.

The parties and platforms in 1860 (how the political system fractured)

The 1860 election is easiest to understand as the collapse of the old party compromise system.

• The Republican Party was a Northern-based party opposed to the expansion of slavery into territories. It promoted “free labor” ideology (the belief that a society of small farmers and wage laborers offered opportunity and dignity) and supported economic policies often associated with Northern development (like internal improvements).
• The Democratic Party split—an important sign that the old national coalition was failing:
  • Northern Democrats backed Stephen A. Douglas, who defended popular sovereignty (letting settlers vote slavery up or down in a territory).
  • Southern Democrats backed John C. Breckinridge, who supported stronger federal protection for slavery in the territories.
• The Constitutional Union Party (candidate John Bell) tried to sidestep slavery and focus on preserving the Union through compromise and enforcement of existing laws.

How the election result translated into crisis

Lincoln won the presidency with a clear Electoral College victory while receiving virtually no Southern electoral votes. That pattern—sectional victory—made the “losing side” in the South doubt whether they could protect slavery through normal politics anymore.

Memory aid: In 1860, think L-D-B-B: Lincoln (Republican), Douglas (N. Democrat), Breckinridge (S. Democrat), Bell (Constitutional Union).

Secession: what it is, why it mattered, and how it worked

Secession is the act of a state attempting to withdraw from the United States. It mattered because it raised the ultimate constitutional question: is the Union a permanent nation, or a voluntary compact that states can leave?

To understand how secession happened, separate three layers:

1. Immediate trigger (political): Lincoln’s election.
2. Stated justification (constitutional): many secessionists argued states had sovereign power and could leave a union they had entered.
3. Underlying cause (slavery): the preservation of slavery was the central motive. Southern leaders repeatedly connected secession to fears about slavery’s future—especially its expansion and the political balance it required.

The secession timeline (high-level)

• South Carolina seceded first in December 1860.
• Other states in the Deep South followed in the winter of 1860–1861.
• The Confederate States of America formed in February 1861, with Jefferson Davis as president.
• After fighting began at Fort Sumter, additional Upper South states seceded.

A common misunderstanding is that all slave states immediately left. Several border states with slavery stayed in the Union (notably Maryland, Kentucky, Missouri, and Delaware). Their choices mattered strategically: they controlled key rivers, rail lines, and the geography around Washington, D.C.

Fort Sumter and the shift from political crisis to war

The transition from secession to war centered on federal property in the seceded states—especially forts.

In April 1861, Confederate forces fired on Fort Sumter in Charleston Harbor after the Lincoln administration attempted to provision the fort. The surrender of Fort Sumter did two crucial things:

• It made compromise dramatically harder by introducing bloodshed and national pride.
• It reframed the conflict for many Northerners as an attack on the United States, increasing support for using force to preserve the Union.

Exam Focus

• Typical question patterns
  • Explain how the collapse of the second party system and the split in the Democrats contributed to sectional conflict.
  • Compare the immediate causes of secession to the underlying causes (often asking you to weigh slavery versus “states’ rights”).
  • Analyze the extent to which Lincoln’s election represented a “revolution” in American politics.
• Common mistakes
  • Treating “states’ rights” as separate from slavery—on APUSH, you’re expected to show that many states’-rights arguments were used to defend slavery.
  • Saying the war began “because Lincoln abolished slavery.” Emancipation became a Union war aim later; the war began as a Union-preservation conflict.
  • Forgetting the importance of border states and assuming North vs. South was a clean geographic split.

The Civil War

What the Civil War was “about” (and how the purpose changed over time)

The Civil War (1861–1865) was a war between the United States (the Union) and the Confederate States of America (the Confederacy) after secession. It matters because it decided (1) whether the Union was permanent and (2) whether slavery would continue to exist in the United States. The war also dramatically expanded federal power and set the stage for Reconstruction.

A key APUSH skill is tracking continuity and change in war aims:

• Initial Union war aim: preserve the Union.
• Confederate war aim: secure independence and protect a society built on slavery.
• Evolving Union war aim: by 1862–1863, the Union increasingly linked victory to the destruction of slavery.

That shift wasn’t just moral; it was strategic. Undermining slavery weakened the Confederate economy and labor system, discouraged European intervention on the Confederacy’s side, and allowed the Union to recruit Black soldiers.

Relative strengths and weaknesses (how each side “worked” as a war machine)

Wars are won by turning resources into sustained military power. Both sides had advantages and major constraints.

A misconception to avoid: the Confederacy’s “defensive war” posture helped early, but defense alone rarely wins without the ability to sustain supplies, replace losses, and maintain civilian morale.

Strategies: how each side tried to win

Union strategy (Anaconda-style thinking)

Many Union leaders favored a strategy often described as the Anaconda Plan (associated with Winfield Scott):

1. Blockade Southern ports to restrict trade, supplies, and revenue.
2. Control the Mississippi River to split the Confederacy.
3. Apply pressure on multiple fronts, eventually taking key Confederate territory and cities.

This strategy was not fast, which frustrated the public. But it reflected a realistic understanding: the North could exploit its naval power and industrial capacity in a long war.

Confederate strategy

The Confederacy sought:

• Defend territory and force the Union to pay an unbearable cost.
• Win key victories (sometimes by taking the fight northward) to weaken Northern morale.
• Gain foreign recognition or support (especially from Britain or France), partly by leveraging cotton exports.

Turning points and major campaigns (conceptual, not just a list)

It’s easy to memorize battles and still not understand the war. A better approach is to learn what changed after key moments.

Early war: proving it would be long and deadly

Early battles like First Bull Run (Manassas) in 1861 shattered illusions of a quick war. The scale of casualties and the difficulties of coordinating large armies forced both sides into mass mobilization.

1862: the war intensifies and the slavery question grows

The Union and Confederacy fought massive battles (for example, Shiloh and Antietam). Antietam (September 1862) was especially important not simply because of casualties, but because it gave Lincoln the political opportunity to announce a major policy shift on slavery.

The Emancipation Proclamation (how it worked, and what it did—and didn’t—do)

The Emancipation Proclamation (effective January 1, 1863) declared freedom for enslaved people in areas in rebellion against the United States.

• What it was: a wartime executive action rooted in Lincoln’s authority as commander-in-chief.
• Why it mattered: it redefined the war as a fight against slavery, enabled broader Black enlistment, and undermined Confederate labor.
• How it worked in practice: it did not immediately free every enslaved person, because it applied primarily to areas the Union did not yet control. But as the Union army advanced, emancipation became real on the ground.

Common misconception: “It freed all enslaved people instantly.” It did not apply to loyal border states or already-occupied areas; permanent abolition required the 13th Amendment (ratified in 1865).

1863: Gettysburg and Vicksburg (why 1863 is often treated as pivotal)

Two major Union successes in July 1863 reshaped the war:

• Gettysburg ended a major Confederate invasion of the North and inflicted severe losses on Lee’s army.
• Vicksburg gave the Union control of the Mississippi River, effectively splitting the Confederacy.

These events mattered because they hit both Confederate military capacity and morale while increasing Union confidence that the war could be won.

1864–1865: “hard war” and the collapse of the Confederacy

By 1864, Union strategy increasingly targeted the Confederacy’s ability to wage war, not just its armies. Under generals like Ulysses S. Grant and William T. Sherman, the Union coordinated relentless pressure.

• Grant’s approach in the East emphasized continuous engagement, accepting casualties to exploit the Union’s advantage in manpower and supply.
• Sherman’s campaigns (including the fall of Atlanta in 1864 and the March to the Sea) demonstrated a form of hard war—damaging infrastructure and resources used to support Confederate armies.

The Confederacy surrendered after Richmond fell and Lee’s army was surrounded. Lee surrendered to Grant at Appomattox Court House in April 1865.

Politics, law, and dissent during wartime (how governments maintained control)

Civil wars strain democracy because governments feel pressure to silence dissent.

• The Union saw intense political conflict, including opposition from Copperheads (Northern Democrats critical of the war).
• Lincoln took controversial actions, including suspending habeas corpus in certain circumstances—raising debates about civil liberties.

A useful way to think about this: wartime leaders often argue that saving the nation must come first, while critics argue that constitutional limits are tested precisely when they are hardest to obey.

Example: how to build a strong APUSH causal argument (mini-model)

If a prompt asks you to evaluate the extent to which emancipation was a turning point in the Civil War, don’t just say “it freed slaves.” A stronger causal chain looks like this:

1. Policy shift: Emancipation reframed the war as anti-slavery.
2. Military effect: It destabilized Confederate labor and encouraged self-emancipation as enslaved people fled to Union lines.
3. Diplomatic effect: It made European support for the Confederacy less likely because aligning with a slaveholding republic became politically costly.
4. Manpower effect: It opened the door to large-scale Black enlistment, strengthening Union forces.

That style—policy → mechanisms → consequences—is what AP graders reward.

Exam Focus

• Typical question patterns
  • Explain how the Union’s military strategy evolved over time and why.
  • Evaluate the significance of the Emancipation Proclamation (military, political, diplomatic).
  • Compare Union and Confederate strengths/limitations and connect them to outcomes.
• Common mistakes
  • Turning essays into battle lists with no analysis. You should use battles as evidence for a claim about strategy, morale, resources, or turning points.
  • Treating emancipation as purely moral or purely strategic. APUSH expects you to show it was both.
  • Ignoring diplomacy and assuming Britain/France were irrelevant—foreign recognition was a real Confederate hope, and Union policy helped prevent it.

Military and Civilian Experience

The “total” nature of the conflict: why civilians were central to the war

The Civil War is often described as a step toward total war (or “hard war”) because it involved not only armies but entire societies. Civilians mattered because they produced food, manufactured goods, provided labor, sustained morale, and exerted political pressure through elections and public opinion.

The war blurred boundaries:

• Armies depended on railroads, farms, factories, and rivers—civilian infrastructure.
• The Confederacy’s economy depended heavily on enslaved labor; as enslaved people fled and as Union forces advanced, emancipation became both a human story and a military reality.
• Governments expanded their reach into everyday life through taxes, conscription, and regulation.

Soldiers’ experiences: what fighting was like and why casualty levels were so high

Civil War soldiers faced:

• Mass armies: citizen-soldiers mobilized on an unprecedented scale for the U.S.
• Deadly technology and tactics mismatch: rifled muskets and improved artillery increased lethality, while commanders often used tactics shaped by older warfare traditions.
• Disease and camp life: illness killed many soldiers, reflecting limited medical knowledge and sanitation.

Understanding soldier life helps you avoid a common simplistic explanation: battles weren’t only deadly because generals were foolish; they were deadly because societies and militaries were adapting—often painfully—to new scale and technology.

African Americans and the war: self-emancipation, service, and stakes

For African Americans, the Civil War was directly tied to freedom and citizenship.

Self-emancipation and “contraband”

As Union armies moved into slaveholding regions, enslaved people fled to Union lines. Union forces often labeled them contraband of war—a term that treated human beings as confiscated enemy property, revealing both the limits and the possibilities of policy in a society still shaped by racism. Still, these escapes forced federal policy to confront the reality that slavery and the war could not be separated.

Black military service

After emancipation became an official war aim, the Union recruited United States Colored Troops (USCT). Black soldiers fought bravely but faced discrimination in pay, assignments, and treatment if captured. Their service mattered because it:

• Added manpower to the Union cause.
• Strengthened the political argument that African Americans deserved freedom and rights.
• Helped redefine the war as a fight over slavery’s legitimacy.

A well-known example is the 54th Massachusetts regiment, which became famous for its assault on Fort Wagner—useful evidence for arguments about Black participation and sacrifice.

Women and the home front: expanded roles and limits

Women’s roles expanded in both the Union and Confederacy as the war demanded labor and organization.

• Many women took on responsibilities in farms, plantations, and businesses as men went to war.
• Women served as nurses and organizers; for example, the U.S. Sanitary Commission supported Union soldiers’ health and supplies, and figures like Clara Barton became associated with wartime medical aid.

It’s important not to overstate this as immediate gender equality. Wartime necessity opened opportunities, but legal and political rights for women remained limited.

Economic change and government power (Union vs. Confederacy)

Union economy

The Union government expanded economic authority to fund the war:

• It issued greenbacks (paper currency not backed by gold) and used new financial tools.
• It passed National Banking Acts, supporting a more standardized banking system.
• It used taxation measures to raise revenue.

These steps mattered because they strengthened federal capacity and helped push the U.S. toward a more modern national economy.

Confederate economy

The Confederacy struggled with:

• Limited industry and rail capacity.
• Union blockade pressure.
• Severe inflation and shortages.

Because the Confederate economy relied heavily on slavery, any disruption to that labor system—flight, Union occupation, or enlistment—hit especially hard.

Conscription and resistance: when governments forced participation

Both sides adopted conscription (the draft), revealing how deeply the war demanded total commitment.

In the Union, the draft became explosive in some communities, contributing to events like the New York City Draft Riots (1863)—a violent uprising shaped by racial tension, class resentment, and fears about competition for jobs. This is a good example of how the war intensified existing social conflicts, not just sectional ones.

A common misconception is to interpret dissent as “treason” or, on the other side, as purely principled. In reality, opposition came from mixed motives: racism, economic anxiety, political ideology, and grief from casualties.

Civil liberties in wartime: security vs. constitutional rights

Wartime pressure led the Lincoln administration to take controversial steps, including suspending habeas corpus in certain contexts and detaining some critics. These choices triggered debates about whether a president can limit civil liberties to save the Union.

You don’t have to “pick a side” to analyze this well. Strong analysis:

• Identifies what the government did.
• Explains why leaders believed it was necessary.
• Evaluates the consequences for democracy and constitutional norms.

(Important related Supreme Court discussion often appears in the broader Period 5 storyline, including Ex parte Milligan (1866), which addressed military trials of civilians—useful for connecting war to postwar constitutional debates.)

Destruction, displacement, and psychological toll

Civilian suffering was widespread:

• Areas invaded repeatedly experienced destroyed crops, homes, and infrastructure.
• Enslaved families faced upheaval—escape could mean freedom, but also separation, poverty, and danger.
• Soldiers and civilians experienced trauma and loss on an enormous scale.

Seeing the war through civilians’ eyes helps you write more sophisticated history: instead of narrating only generals and presidents, you can show how policy decisions and military campaigns changed daily life.

Exam Focus

• Typical question patterns
  • Analyze how the Civil War affected civil liberties and the relationship between citizens and the federal government.
  • Explain how different groups—enslaved people, free Black Americans, women, immigrants, working-class Northerners—experienced the war.
  • Evaluate the extent to which the Civil War represented a shift toward modern war (mobilization, economy, civilian targets).
• Common mistakes
  • Treating “home front” as a side story. On APUSH, home front developments are often framed as causes of military outcomes (morale, supply, politics).
  • Overstating emancipation as instant and universal in 1863 rather than a process that accelerated with Union victory.
  • Ignoring internal conflicts within the Union and Confederacy (draft resistance, dissent, class tensions), which are frequently used for complexity points in essays.