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This guide is for AQA A-level History (7042), Component 2, option 2J: America: A Nation Divided, c1845-1877. It begins with a federal republic already divided over slavery and expansion, and ends after the retreat from Radical Reconstruction in 1877.

The examination lasts 2 hours 30 minutes, is worth 80 marks and contributes 40% of the A level. You answer one compulsory 30-mark question evaluating three primary or contemporary sources and two 25-mark essays chosen from three.

This is a depth study. You need to explain how sectional conflict developed, why compromise failed, how the Union won the Civil War and why emancipation did not secure lasting political equality.

The whole course in one argument

The Civil War was not caused by two timeless and uniform regions simply growing apart. The Union contained constitutional arrangements and political habits that had managed earlier disputes, but westward expansion repeatedly reopened the question of whether slavery would extend into new territories. Different labour systems, economic interests, racial ideologies and political cultures mattered because they shaped the struggle over slavery and federal power.

Compromises postponed rupture while sometimes intensifying it. The Compromise of 1850 settled some territorial questions but the Fugitive Slave Law nationalised the enforcement of slavery. Kansas-Nebraska overturned an older boundary, encouraged violence and helped destroy the existing party system. Dred Scott, Harpers Ferry, Democratic division and Lincoln's election hardened positions. Secession was a political choice led by slaveholding states seeking to protect slavery; war was not inevitable in 1845, but slavery was central to the crisis that produced it.

Union victory depended upon greater population, industry, finance and naval power, but resources had to be mobilised through political leadership, military learning and sustained public support. Emancipation transformed the war's purpose and enabled Black military service. Reconstruction then attempted to rebuild the Union and define freedom. Constitutional amendments and federal enforcement opened citizenship and political participation, while presidential conflict, landlessness, organised white-supremacist violence and weakening northern commitment made those gains insecure. By 1877 slavery had been destroyed, but equal citizenship was far from safely enforced.

Keep returning to one question: why could the federal Union defeat secession but not secure the full and lasting consequences of emancipation?

Six questions holding the course together

1. How did federalism and sectional difference shape the United States in c1845?
2. Why did expansion make slavery harder to contain politically?
3. Why did compromise collapse between 1854 and 1861?
4. Why did the Union defeat the Confederacy?
5. Why did early Reconstruction create conflict between presidents and Congress?
6. Why had Radical Reconstruction retreated by 1877?

Essential vocabulary

• Federalism: the division of authority between the national government and the states.
• Sectionalism: political loyalty and conflict organised around regional interests.
• Popular sovereignty: allowing settlers in a territory to decide whether slavery would be permitted.
• Abolitionism: organised opposition seeking the destruction of slavery; abolitionists differed in methods and wider views about equality.
• Free labour: the ideal that workers should be free to sell their labour and rise through individual effort; it was not the same as support for racial equality.
• Secession: withdrawal of a state from the Union.
• Confederacy: the government formed by the seceding southern states.
• Emancipation: release from slavery.
• Reconstruction: the process of restoring the Union and determining the political, legal and social consequences of emancipation.
• Radical Republican: a Republican who supported stronger congressional action to reconstruct the South and protect freedpeople's rights.
• Amendment: a formal change to the Constitution.
• Redeemer: a southern Democrat seeking to end Republican Reconstruction and restore white Democratic control.

Part one: the origins of the American Civil War, c1845-1861

1. North and South in c1845

The Constitution divided power between federal and state governments. Congress made federal law, the president executed it and the Supreme Court interpreted constitutional disputes. This system enabled bargaining, but it left arguments about state sovereignty and slavery unresolved. The Missouri Compromise of 1820 had balanced admission of free and slave states and restricted slavery in part of the Louisiana territory. The Nullification Crisis of 1832-33 had already tested whether a state could reject federal authority.

Neither section was uniform. The North contained commercial cities, family farms, industry and expanding transport networks, alongside sharp class, ethnic and racial divisions. Immigration strengthened its workforce and political culture. The South also contained towns, industry, small farmers and people who owned no enslaved labourers, but plantation slavery dominated wealth, political power and social hierarchy. Enslaved people resisted, negotiated, preserved families and pursued freedom within a violent system that denied their autonomy.

Expansion moved the conflict. Manifest Destiny presented continental growth as a national mission, but land was already inhabited and expansion relied upon war, federal power and the dispossession of Native and Mexican communities. Southern leaders feared a future in which free states would dominate federal institutions; many northerners opposed slavery's expansion without supporting immediate abolition or racial equality.

Knowledge check: Give two differences within each section. Why could federalism both manage and intensify conflict?

2. Attempts to maintain the Union, c1845-1854

Victory over Mexico brought vast western territories. The Wilmot Proviso proposed excluding slavery from land acquired from Mexico. It did not become law, but exposed sectional voting. California's request for admission as a free state threatened the existing balance.

Henry Clay assembled proposals that Stephen Douglas helped pass separately as the Compromise of 1850. California entered free; Texas accepted a boundary settlement; New Mexico and Utah would use popular sovereignty; the slave trade, though not slavery, ended in Washington DC; and a stronger Fugitive Slave Law required federal cooperation in recovering escapees. President Zachary Taylor had favoured rapid admission of California and New Mexico before his death changed the political setting.

The settlement reduced immediate danger but redistributed conflict. The Fugitive Slave Law compelled people in free states to confront federal enforcement and denied alleged fugitives normal legal protections. Black communities organised resistance and vigilance. Abolitionists such as William Seward attacked the extension of slave power, while literature and newspapers shaped public feeling. European immigrants strengthened northern population and economic power but held varied political and racial views.

Southern politicians such as Jefferson Davis treated attacks on slavery as threats to property, security and equal standing within the Union. John Brown represented a militant abolitionism that most northerners did not share. Compromise therefore remained possible, but it did not remove the struggle over who controlled the territories and federal state.

Knowledge check: Identify one achievement and two destabilising consequences of the Compromise of 1850.

3. The outbreak of Civil War, 1854-1861

The Kansas-Nebraska Act of 1854 used popular sovereignty and effectively repealed the Missouri restriction. Rival settlers and outside supporters fought to determine Kansas's future. Bleeding Kansas showed that local voting could become intimidation, competing governments and violence.

The controversy damaged the Whigs and encouraged the Republican Party, which opposed slavery's territorial expansion. Republicans spread rapidly across the North. John C Fremont's performance in 1856 demonstrated their potential, while figures including Lincoln, Seward and Salmon Chase offered different emphases within the new coalition.

The Supreme Court's Dred Scott decision in 1857 ruled that African Americans could not be citizens and that Congress could not prohibit slavery in the territories. Instead of settling the dispute, it strengthened northern fears of a slave-power conspiracy. The Lincoln-Douglas debates exposed the unstable relationship between popular sovereignty and Dred Scott. Brown's raid on Harpers Ferry in 1859 failed militarily but intensified southern fears and produced divided northern reactions.

The Democratic Party split in 1860, allowing Lincoln to win without carrying the Deep South. Secessionists presented his victory as a threat even though he promised not to abolish slavery where it existed. South Carolina and other slave states seceded and formed the Confederacy. Failed compromise and the attack on Fort Sumter turned constitutional breakdown into war.

Knowledge check: Why did Kansas-Nebraska reshape the party system? Explain why Dred Scott and Harpers Ferry hardened positions without making war automatic.

Part two: Civil War and Reconstruction, 1861-1877

4. The War, 1861-1865

The Confederacy defended its territory, possessed skilled commanders and could hope northern voters would tire of war. Yet it had a smaller population, less industry, weaker railway integration, limited finance and difficulty overcoming the Union blockade. President Jefferson Davis faced state resistance to central mobilisation. Hopes of formal British or French recognition failed.

The Union had greater manpower, manufacturing, finance, shipping and rail capacity. These were advantages, not automatic victory. Lincoln had to preserve the border states, maintain political support, find effective commanders and coordinate armies across a vast theatre. Early defeats and costly battles demonstrated Confederate resilience.

The war developed through connected theatres and strategies. The Union blockade restricted Confederate trade. Control of the Mississippi, completed at Vicksburg in 1863, divided the Confederacy. Gettysburg stopped Lee's northern invasion but did not by itself end the war. Grant coordinated sustained pressure while Sherman attacked transport, supplies and Confederate war-making capacity. Union victory followed cumulative military, economic and political strain.

The Emancipation Proclamation applied to enslaved people in areas in rebellion and made destruction of slavery a Union war aim. Enslaved people had already weakened slavery by escaping to Union lines and providing knowledge and labour. Almost 180,000 Black men served in the United States Colored Troops, linking their own action to Union victory. The Thirteenth Amendment then abolished slavery nationally.

War devastated the South and killed hundreds of thousands across both sections. Victory preserved the Union and destroyed legal slavery, but left unresolved how former Confederate states would return and what freedom would mean in land, work, law and political power.

Knowledge check: Rank three Union advantages. For each, explain the political or military action needed to turn capacity into victory.

5. Early Reconstruction, 1865-1867

Lincoln favoured reunion with limited conditions, while insisting by war's end upon emancipation. His assassination transferred the presidency to Andrew Johnson, a southern Unionist committed to rapid restoration and white political control. Presidential Reconstruction allowed former Confederate elites to regain influence. Southern states passed Black Codes restricting freedpeople's movement, labour and autonomy.

Freedom was not simply given from above. Freedpeople reunited families, established churches and schools, negotiated labour, sought land and organised politically. The Thirteenth Amendment ended slavery but allowed involuntary servitude as punishment for crime, creating a dangerous opening for coercive labour systems.

Congressional Republicans rejected Johnson's settlement. The Fourteenth Amendment defined national citizenship, required equal protection and penalised states that denied male citizens the vote. Radical Republicans such as Thaddeus Stevens wanted stronger transformation. Johnson opposed congressional measures, broke with Republicans and campaigned against the amendment.

The Reconstruction Acts of 1867 divided the former Confederacy into military districts and required new state constitutions and ratification of the Fourteenth Amendment. Conflict over Johnson's obstruction and removal of Secretary of War Edwin Stanton led to impeachment. The Senate acquitted him by one vote, but congressional Reconstruction survived.

Knowledge check: Why did presidential and congressional Reconstruction diverge? What could constitutional change achieve, and what still depended upon enforcement?

6. Radical Reconstruction, 1867-1877

Ulysses Grant won the presidency in 1868, while Johnson's Christmas amnesty restored rights to most former Confederates. The Fifteenth Amendment prohibited denying the vote because of race, colour or previous servitude. Black men voted and held local, state and federal office. Southern Unionists and newcomers also supported Republican state governments, which expanded public education and rebuilt institutions.

These governments faced genuine problems and opposition, but hostile labels such as carpetbagger and scalawag were also used to delegitimise biracial politics. Federal troops and Enforcement Acts challenged the Ku Klux Klan. Grant's administration suppressed some terror, yet enforcement was uneven and violence reappeared through other organisations and local campaigns.

Southern Democrats and Redeemers combined electoral organisation, racial appeals, economic power, intimidation and murder to recover state governments. Disputes over voter registration were therefore struggles over who could exercise citizenship. Sharecropping gave freed families some control over daily work compared with gang slavery, but debt and landlessness created severe dependence.

Northern commitment weakened as economic crisis, political scandal, racism and other priorities reduced support for intervention. The disputed presidential election of 1876 ended in a political settlement that placed Republican Rutherford Hayes in office and removed remaining federal troops from southern statehouses. By 1877 constitutional citizenship and voting amendments remained, but federal protection had retreated and white Democratic control was being restored.

Do not call Reconstruction a complete failure. It destroyed slavery, rewrote the Constitution, created public institutions and demonstrated Black political agency. Do not call it a completed success either. Rights without durable enforcement, economic independence or protection from terror remained vulnerable.

Knowledge check: Explain one achievement, one limitation and one cause of the retreat from Reconstruction by 1877.

Anchor dates

• 1820: Missouri Compromise.
• 1846-48: Mexican-American War.
• 1850: Compromise of 1850 and Fugitive Slave Law.
• 1854: Kansas-Nebraska Act and Republican emergence.
• 1857: Dred Scott decision.
• 1859: Harpers Ferry raid.
• 1860: Lincoln elected; secession begins.
• 1861: Fort Sumter; Civil War begins.
• 1863: Emancipation Proclamation, Gettysburg and Vicksburg.
• 1865: Confederate defeat, Lincoln assassinated and Thirteenth Amendment ratified.
• 1867: Reconstruction Acts.
• 1868: Fourteenth Amendment ratified; Grant elected.
• 1870: Fifteenth Amendment ratified.
• 1877: federal retreat from southern Reconstruction.

How to answer the source question

Section A asks you to evaluate three primary or contemporary sources for their value to a historian investigating a precise issue. Do not award or remove value merely because a source is contemporary, political or biased.

For each source:

1. identify its argument, language and emphasis;
2. test its claims using precise contextual knowledge;
3. examine who produced it, when, for whom and for what purpose;
4. connect provenance to the exact enquiry: what can the source reveal, and what is it likely to conceal or distort?
5. reach a supported judgement about overall value.

A secession declaration is highly valuable for official justification but cannot represent every white southerner or enslaved person. A campaign speech reveals how a politician framed an issue for an audience, not simply private belief. A freedperson's testimony may illuminate lived experience while still reflecting the setting in which it was collected. Evaluate usefulness for the enquiry, not an imaginary standard of neutrality.

How to build the essays

Organise each essay around a judgement rather than a chronology. For a question claiming that Lincoln's leadership was the main reason for Union victory, compare leadership with resources, military command, strategy, emancipation and Confederate weaknesses. Connect them: leadership mattered partly because it mobilised resources, managed politics and eventually coordinated military pressure.

Use a stated criterion. Main cause might mean indispensable, most consistently influential or the factor that best explains the timing of an outcome. For Reconstruction, distinguish constitutional change, political participation, economic freedom, physical security and durability. A settlement can succeed by one measure and fail by another.

Practice before you leave

1. Why did expansion after the Mexican War destabilise the Union?
2. How successful was the Compromise of 1850?
3. How far was the Kansas-Nebraska Act responsible for the outbreak of Civil War?
4. Why did the Union defeat the Confederacy?
5. How important was emancipation to Union victory?
6. Why did Congress take control of Reconstruction by 1867?
7. How far had Reconstruction transformed the South by 1877?
8. Evaluate one contemporary source from your course materials for an enquiry about sectional conflict, war or Reconstruction.

If the course still feels tangled

Reduce it to a chain: expansion reopened slavery; compromise spread the conflict; party breakdown enabled secession; Union mobilisation defeated the Confederacy; emancipation changed the Constitution; contested enforcement limited Reconstruction. Then return to one section and add the people, evidence and alternative causes.

Your next step

Draw six boxes using the course sections. In each box write one conflict over federal authority, one action taken by people outside the presidency and one judgement about what changed. Then practise one source paragraph and one comparative essay plan.