Causes of the Civil War

One fundamental cause

The American Civil War had many surface quarrels, but beneath them lay one fundamental cause: slavery. The nation had split into a free North and a slave South, and the question of whether slavery would spread to new western territories brought the divide to breaking point. ⚠️ Recognise slavery as the root cause, while weighing how the divisions built. Some later called the war a matter of state rights, but the right the South defended was above all the right to hold and extend slavery.

The North, and the South

By 1860 the two had grown into very different societies. Hold them together.

Order the road to war

Put the steps by which the divide over slavery reached war into order.

• The North and South grow ever more divided over slavery
• The fiercest quarrels are over slavery spreading to new territories
• Abraham Lincoln, opposed to the spread of slavery, is elected in 1860
• Southern states secede to form the Confederacy
• War breaks out between North and South

The fundamental cause

What was the fundamental cause of the American Civil War?

• Slavery: the deep divide between the free North and the slave South, brought to a head over whether slavery would spread to new territories
• A simple disagreement about foreign trade
• An invasion by a foreign power
• There was no real cause; it happened by accident

Words for the causes

Five words that let you explain the causes, rather than just narrate them.

Identify the divisions before the war

Three of these were true of the divisions before the war. Choose the three.

• The North and South differed fundamentally over slavery
• The fiercest quarrels were over slavery spreading to new territories
• The South was determined to protect and extend slavery
• The North and South fully agreed about slavery
• Slavery played no part in the divisions

Why slavery was the root cause

The sharpest answers name slavery as the fundamental cause and do not hide behind the later euphemism of state rights. The right the South was defending was, above all, the right to hold enslaved people and to extend slavery westward. That is what state rights meant in practice here. The North and South had grown into two different societies, and every crisis, over new territories, over runaway slaves, over the election of Lincoln, came back to slavery. So the divisions built over years, but slavery was the root, and saying so plainly is the grade 9 move.

Match each Civil War term to its meaning

Find the sentence that names the root cause

A student explains the causes. Select the ONE sentence that names slavery as the fundamental cause.

• Although framed by some as a fight over state rights, the war grew fundamentally from slavery, above all the struggle over whether it could spread to new territories.
• The war had nothing whatever to do with slavery.
• The war was purely about foreign trade.
• The war happened by accident, with no real cause.

Finding the fundamental cause

Historians are careful to tell the fundamental cause of an event apart from its surface quarrels and its final trigger. A dispute may have many flashpoints and be dressed up in other language, yet still rest on one underlying issue. The test is whether, when you trace each quarrel back, they all lead to the same root. Here they do. Follow the fights over territory, over runaway people held in bondage, and over the election, and each leads back to slavery. That is why historians name it the fundamental cause.

Complete the account of the causes

The holding of people as property, and the fundamental cause of the war, was _____. A state formally leaving the Union was _____. The breakaway Southern states formed the _____. The movement to end slavery was _____. The president elected in 1860, opposed to the spread of slavery, was _____.

Understand the causes correctly

Which is the soundest understanding of the causes of the Civil War?

• Slavery was the fundamental cause: the divide between free North and slave South, brought to breaking point over the expansion of slavery, led to secession and war
• It was purely about state rights, with slavery playing no part
• It was mainly a quarrel about foreign trade
• The election of Lincoln caused it entirely by itself

The root cause, and the surface claims

A strong answer sees through the surface claims to the root beneath them.

Judge the causes like an examiner

You are marking three claims about the causes of the Civil War. For each, choose the soundest judgement.

• An essay says the war had nothing to do with slavery. Is that safe?
• An essay says the war was purely about state rights. Is that safe?
• An essay says the election of Lincoln caused the war by itself. Is that safe?

Write: why the Civil War broke out

Why did the American Civil War break out? Show that slavery was the fundamental cause, explain how the divisions built, and reach a judgement. This is written in English and is not auto-marked.

• Explain how the North and South differed over slavery
• Explain the fight over the expansion of slavery
• Explain the election of Lincoln and secession
• Address the state-rights framing and see through it
• Reach a supported judgement naming slavery as the root cause