The Dred Scott decision, handed down by the U.S. Supreme Court on March 6, 1857, held three things: no person of African descent could be a citizen of the United States, Congress had no power to ban slavery in federal territories, and enslaved people were property protected by the Fifth Amendment. Chief Justice Roger Taney wrote for a 7–2 majority in Dred Scott v. Sandford, and the ruling is widely regarded as one of the worst in the Court’s history. It inflamed the North, split the Democratic Party, and accelerated the country’s descent into civil war.
Who Dred Scott Was
Dred Scott was born enslaved in Virginia and later purchased by John Emerson, a U.S. Army surgeon. Between the mid-1830s and 1840, Emerson took Scott to Fort Armstrong in Illinois, a free state, and then to Fort Snelling in the Wisconsin Territory, where slavery was prohibited under both the Northwest Ordinance of 1787 and the Missouri Compromise of 1820. Scott married Harriet Robinson at Fort Snelling, and the family eventually returned to Missouri.
After Emerson died in 1843, his widow Irene refused Scott’s offer to purchase his family’s freedom. On April 6, 1846, Dred and Harriet Scott each filed petitions in the St. Louis Circuit Court suing for their liberty. Their theory rested on a Missouri doctrine known as “once free, always free,” under which the state’s courts had recognized since 1824 that an enslaved person taken to live in a free jurisdiction became permanently free, even after returning to a slave state.1Missouri Secretary of State. History of Slave Freedom Suits in Missouri
Scott won at trial, but in 1852 the Missouri Supreme Court reversed, abandoning the earlier precedent. Irene Emerson had by then transferred Scott to her brother, John F.A. Sandford of New York, and Scott refiled in federal court under diversity jurisdiction, arguing that a free citizen of Missouri could sue a citizen of New York.2Justia U.S. Supreme Court Center. Dred Scott v. Sandford The case reached the Supreme Court in the October 1856 term.
The Ruling on Citizenship
The core of Taney’s opinion held that no person of African descent, whether enslaved or free, could be a citizen of the United States. Taney read the Constitution to view people of African ancestry as “a separate class of persons” the framers never intended to include in the political community.3National Archives. Dred Scott v. Sandford (1857) A state might grant certain rights to its Black residents, he conceded, but that could never rise to national citizenship under Article III.
Taney reinforced the point through the Privileges and Immunities Clause of Article IV. If free Black people were state citizens, he argued, the Clause would automatically entitle them to travel, speak publicly, hold political meetings, and carry arms in every state. The “great men of the slaveholding States,” Taney insisted, would never have ratified a Constitution with such consequences.4Congress.gov. Citizenship Under Privileges and Immunities Clause The reasoning shut an entire class of people out of the federal courts.
The Missouri Compromise Struck Down
Having found Scott lacked standing, the Court could have stopped. It did not. The majority pressed on to declare the Missouri Compromise of 1820 unconstitutional, marking only the second time since Marbury v. Madison that the Supreme Court struck down a major act of Congress.5National Archives. Missouri Compromise (1820) The Compromise had prohibited slavery in federal territories north of the 36°30′ parallel.
Taney grounded the holding in the Fifth Amendment and a narrow reading of the Territorial Clause in Article IV, Section 3. Because the Constitution treated enslaved people as property, he wrote, “every citizen has a right to take with him into the Territory any article of property which the Constitution of the United States recognises as property.” A federal law that automatically freed enslaved people upon entering a territory amounted to taking a citizen’s property without due process.6Oyez. Dred Scott v. Sandford Under this framework, Congress had an affirmative duty to protect slaveholders’ property interests everywhere in the nation.
The ruling opened every federal territory to slavery and destroyed the principal legislative tool Congress had used to manage sectional conflict for a generation. It also gutted the “popular sovereignty” position Senator Stephen Douglas of Illinois had built his career on. If Congress itself could not ban slavery in a territory, a territorial legislature created by Congress could hardly do so either.
The Jurisdictional Contradiction
Because Scott was not a citizen, the Court held he could not invoke diversity jurisdiction, and it ordered the lower court to dismiss the case for want of jurisdiction.3National Archives. Dred Scott v. Sandford (1857) Critics pounced on the logical problem: if the Court lacked jurisdiction, it had no authority to reach the merits of the Missouri Compromise or the property question. Taney’s decision to rule on those issues anyway convinced many Northerners the opinion was a political act in judicial dress.
The Dissents
Justices Benjamin Curtis and John McLean each filed detailed dissents. Curtis’s is the one legal historians remember, because it took apart Taney’s history piece by piece. Curtis identified five states — New Hampshire, Massachusetts, New York, New Jersey, and North Carolina — where free Black men were recognized as citizens when the Constitution was ratified. In the first four they could vote, and North Carolina’s supreme court had held that freed slaves born there were citizens.7Supreme Court of the United States. Guardian of the Constitution: The Counter Example of Dred Scott How, Curtis asked, could the Constitution exclude from the word “citizen” the very people who voted on its ratification? He also noted that when the Articles of Confederation guaranteed rights to “free inhabitants,” delegates had explicitly voted down a proposal to insert the word “white.”
McLean went after the property argument. Slavery, he wrote, was a creature of local law, not a universal right that traveled with the slaveholder. When a master voluntarily brought an enslaved person into a free jurisdiction, the local law of freedom controlled. Missouri’s own courts had followed exactly that principle for twenty-eight years. McLean also defended Congress’s power to legislate for the territories under Article IV, arguing that the power to “make all needful rules and regulations” plainly included the power to prohibit slavery.
Political Fallout
Rather than settling the slavery question, the decision persuaded much of the North that slaveholders were using the courts to nationalize slavery. Abraham Lincoln argued that the ruling, together with the Kansas-Nebraska Act, worked to make slavery a national institution. In the 1858 Illinois Senate debates with Douglas, Lincoln framed his central argument around it: the nation could not endure “permanently half Slave and half Free” and would eventually become “all one thing, or all the other.” The debates raised Lincoln’s national profile and helped him win the Republican nomination in 1860.
Douglas was caught between Southern Democrats demanding federal protection for slavery in the territories, which Dred Scott implied, and Northern voters who would not accept it. The Democratic Party split along sectional lines at its 1860 convention, ran two candidates, and handed the election to Lincoln.
What Happened to Dred Scott
The legal record does not tell the end of Scott’s own story. Shortly after the ruling, the sons of Peter Blow — the family that had originally owned Scott in Virginia and had helped finance his lawsuit — arranged for his emancipation. Scott and Harriet were freed in May 1857, two months after the decision. Scott worked as a porter in St. Louis but lived only about a year as a free man before dying of tuberculosis in September 1858.
How the Reconstruction Amendments Overturned It
The Civil War produced the constitutional amendments that dismantled every part of the decision. The Thirteenth Amendment, ratified in December 1865, abolished slavery throughout the United States and eliminated the property classification at the heart of Taney’s Fifth Amendment analysis.8National Archives. 13th Amendment to the U.S. Constitution: Abolition of Slavery
The Fourteenth Amendment, ratified in 1868, directly overturned the citizenship holding. Its opening sentence declares: “All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside.”9National Archives. 14th Amendment to the U.S. Constitution: Civil Rights (1868) The Citizenship Clause was written to repeal Dred Scott by placing birthright citizenship beyond the reach of any court opinion. The same amendment guaranteed equal protection and due process to all persons, the very rights Taney had said people of African descent could never hold. Together the two amendments rewrote the constitutional framework the decision had rested on, and the legal architecture of Dred Scott could not be reassembled.