In the 1850s, the compromises stopped working. A new law let settlers in Kansas vote slavery up or down, and both sides rushed people in; the territory bled. In 1857 the Supreme Court ruled, in the Dred Scott case, that Black Americans were not citizens and that Congress could not keep slavery out of the territories at all. Instead of settling the argument, the ruling poured fuel on it.
Abraham Lincoln ran for president in 1860 on one clear position: slavery could stay where it was, for now, but it must not spread. “A house divided against itself cannot stand,” he had said — the country could not remain half slave and half free forever. He won without a single Southern state. Rather than accept the result, Southern states began to secede — to leave the Union — and they said plainly, in their own declarations, what they were leaving to protect: slavery.
In April 1861, Confederate guns fired on a federal fort in Charleston harbor, and the Civil War began. It lasted four years and killed about 750,000 people — more American dead than any other war before or since. It was fought by farm boys and factory workers, immigrants fresh off the boat, and, before it ended, by nearly 200,000 Black soldiers and sailors fighting for a freedom the law had denied them.
Freedom did not wait for permission. From the war’s first months, enslaved people walked away from plantations toward the Union armies, forcing the question before Washington had answered it. On January 1, 1863, Lincoln issued the Emancipation Proclamation, declaring the enslaved people of the rebel states free. It was a war measure, written in cold legal language — and it turned the Union army into an army of liberation. Wherever it advanced, slavery collapsed.
At Gettysburg, later that year, Lincoln stood on the battlefield and said what the war had become: a test of whether government of the people, by the people, for the people could survive on this earth. In April 1865 the Confederacy surrendered. Days later, Lincoln was shot dead by a Confederate sympathizer. And before the year ended, the Thirteenth Amendment was added to the Constitution: slavery in the United States was abolished, forever.
The war settled two questions at terrible cost: no state may leave the Union, and no person may be owned. It opened the next question, which the country still argues today — what does freedom actually include?