Unit 7: The Civil War · Lesson 1
Causes of the Civil War
What this lesson is for
- Students will learn about Causes of the civil war
- Students will understand how people live together in communities

Blessed are the peacemakers: for they shall be called the children of God.
Matthew 5:9
Causes of the Civil War
The American Civil War (1861–1865) was the most costly conflict in American history — over 620,000 soldiers died, more than in all other American wars combined. The war had many causes that built over decades, but at the heart was the institution of slavery — a system so morally wrong that the nation could not remain "half slave and half free," as Abraham Lincoln said. Understanding the war's causes helps us see both the tragedy of American sin and the long-delayed work of justice.
Key Terms: slavery — the practice of owning human beings as property, forcing them to labor without pay or freedom; abolitionism — the movement to end slavery; states' rights — the argument that states have the right to make their own decisions on issues like slavery; sectionalism — the growing differences between Northern and Southern ways of life; the Missouri Compromise (1820) and Compromise of 1850 — legislative deals that tried to balance slave and free states.
The United States was founded with a terrible contradiction: the Declaration of Independence proclaimed all men equal, yet the Constitution protected slavery. The Southern economy depended on enslaved labor for cotton, tobacco, and rice plantations. The North industrialized rapidly, with paid labor and a growing moral movement against slavery. The abolitionist movement — led by figures like Frederick Douglass (an escaped slave) and William Lloyd Garrison — argued that slavery was a grave sin against God and humanity. Harriet Beecher Stowe's novel "Uncle Tom's Cabin" (1852) brought the reality of slavery to Northern readers in unforgettable terms.
Political compromise became impossible. The Missouri Compromise (1820), the Compromise of 1850, and the Kansas-Nebraska Act (1854) all tried to balance slave and free states but only delayed conflict. "Bleeding Kansas" — violent clashes between pro-slavery and anti-slavery settlers in Kansas — showed the nation was heading toward violence. The Supreme Court's Dred Scott decision (1857) — ruling that enslaved people were property with no rights — outraged the North. When Abraham Lincoln, who opposed the spread of slavery, won the presidency in November 1860, seven Southern states seceded before he even took office.
Important People/Events:
- Frederick Douglass (1818–1895) — escaped slave, brilliant author and orator, leading abolitionist
- Harriet Beecher Stowe (1811–1896) — author of "Uncle Tom's Cabin" (1852), which turned Northern opinion against slavery
- The Dred Scott Decision (1857) — Supreme Court ruling that enslaved people had no rights; shocked the North
Proverbs 14:34 states: "Righteousness exalteth a nation: but sin is a reproach to any people." Slavery was a national sin — a "reproach" that could not stand forever. Abolitionists like Sojourner Truth and Frederick Douglass quoted the Bible constantly: "Are not all men brothers? Did not God create all of one blood?" (Acts 17:26). Many Christians on both sides of the war believed God was on their side. Lincoln famously asked in his Second Inaugural: "Both read the same Bible and pray to the same God." He saw the war as God's judgment on the nation for the sin of slavery.
Homework
Answer the review questions about Causes of the civil war.
Note for the parent
Today's lesson covers Causes of the Civil War. Estimated time: 30 minutes. Encourage independent work but be available for questions.
The first three of this lesson's 10 questions
What was at the heart of the Civil War's causes?
Show the answer
Answer: The institution of slavery
How many soldiers died in the Civil War?
Show the answer
Answer: Over 620,000
What is abolitionism?
Show the answer
Answer: The movement to end slavery
Another 7 questions follow in the lesson itself, each one graded the moment it is answered.



