The Dred Scott decision was a March 6, 1857 U.S. Supreme Court ruling that held Black people, whether free or enslaved, were not citizens of the United States and could not sue in federal court, and that Congress had no constitutional authority to ban slavery in federal territories.1Oyez. Dred Scott v. Sandford The 7-2 decision struck down the Missouri Compromise of 1820, inflamed the sectional crisis over slavery, and is widely regarded as one of the worst rulings in the Court’s history. It was ultimately repudiated not by the Court itself but by the Thirteenth and Fourteenth Amendments after the Civil War.
Who Dred Scott Was and How the Case Reached the Court
Dred Scott was an enslaved man owned by John Emerson, a U.S. army surgeon. Starting in 1833, Emerson took Scott to Fort Armstrong in Illinois, a free state, and then to Fort Snelling in the Wisconsin Territory, where the Missouri Compromise prohibited slavery.2National Archives. Dred Scott v. Sandford Scott lived in those free jurisdictions for roughly a decade before returning to Missouri, a slave state.
In 1846, Scott sued for his freedom in the St. Louis Circuit Court, relying on a Missouri legal principle in place since 1824: once free, always free. Under that doctrine, an enslaved person taken to live in a free state or territory became free, and returning to a slave state did not undo that status.3Missouri Secretary of State. Before Dred Scott – History of Slave Freedom Suits in Missouri Other enslaved plaintiffs in St. Louis had won their freedom on this exact argument. What made Scott’s case different was that it eventually reached the Supreme Court, where the justices used it to answer far bigger questions than his personal status.
What the Supreme Court Actually Held
Chief Justice Roger B. Taney wrote the majority opinion. He began with a threshold question about whether Scott could even bring a case in federal court. Federal courts could hear lawsuits between citizens of different states under what is known as diversity jurisdiction.4Constitution Annotated. Overview of Diversity Jurisdiction To use that pathway, Scott had to qualify as a citizen. The majority ruled he did not.
The Court held that no person of African descent, whether enslaved or free, could be a citizen of the United States as the framers understood that term.1Oyez. Dred Scott v. Sandford Taney relied on a selective reading of colonial-era laws and the Declaration of Independence to argue that Black people had been regarded as so inferior at the founding that they were never meant to share in the rights the Constitution protected. States could grant local rights to Black residents, the opinion said, but that did not confer national citizenship or the right to sue in federal court.2National Archives. Dred Scott v. Sandford
Having declared Scott a non-citizen, the majority went further. Taney ruled that Congress had no constitutional authority to prohibit slavery in federal territories. The reasoning rested on the Fifth Amendment’s protection against government taking property without due process. Because the Court classified enslaved people as property, any federal law that freed them simply for entering a territory amounted to an unconstitutional seizure.1Oyez. Dred Scott v. Sandford
That holding wiped out the Missouri Compromise of 1820, which had banned slavery north of the 36°30′ latitude line in the Louisiana Territory for nearly four decades.5National Archives. Missouri Compromise (1820) It was only the second time in American history that the Supreme Court had struck down a major act of Congress. Slaveholders could now bring enslaved people into any federal territory without fear of federal restriction.
The Dissents
Justices Benjamin Robbins Curtis and John McLean each wrote forceful dissents. Curtis attacked the citizenship ruling by pointing out that at the time the Constitution was ratified, free Black men in at least five states had the right to vote and were considered citizens, directly contradicting Taney’s historical claim.1Oyez. Dred Scott v. Sandford
Both dissenters also rejected the majority’s reasoning on congressional power. Article IV of the Constitution gave Congress clear authority to make “needful rules and regulations” for the territories, and decades of legislative practice and prior court decisions had upheld Congress’s power to prohibit slavery there. Curtis added a procedural criticism that still cuts: if the Court truly lacked jurisdiction because Scott was not a citizen, it had no business ruling on the Missouri Compromise at all. By reaching the merits after dismissing the case, Taney contradicted his own logic.
Why the Ruling Mattered
The Court had intended the decision to settle the national argument over slavery. It did the opposite. In the North, the ruling produced outrage. Abolitionists treated it as proof that the federal government was captured by slaveholding interests. Free-Soilers, antislavery Democrats, and moderates who had stayed out of the fight all flowed into the growing Republican Party.
Abraham Lincoln made the case central to his political arguments. In his 1858 “House Divided” speech, he warned that the ruling was part of a broader effort to make slavery lawful everywhere, describing political machinery designed so that slavery would “become alike lawful in all the States, old as well as new — North as well as South.”6Abraham Lincoln Online. House Divided Speech The argument landed because it made slavery feel like a national threat rather than a distant southern issue.
The decision also split the Democratic Party. Southern Democrats demanded federal legislation codifying the ruling; northern Democrats could not accept that position at home. The split produced three competing candidates in the 1860 presidential election, allowing Lincoln to win with less than 40 percent of the popular vote. His name did not appear on the ballot in ten slaveholding states. Within months of his inauguration, southern states began seceding, and the Civil War followed.
How the Decision Was Overturned
The Dred Scott ruling was never reversed by another Supreme Court decision. It took a war and two constitutional amendments to undo it.
The Thirteenth Amendment, ratified December 6, 1865, abolished slavery throughout the United States and every territory under its control.7Constitution Annotated. Thirteenth Amendment By ending slavery itself, it destroyed the legal foundation of the Court’s property-rights argument. Enslaved people could no longer be classified as property beyond the reach of federal law.
The Fourteenth Amendment, ratified in 1868, directly targeted the citizenship holding. Its opening sentence reads: “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.”8Constitution Annotated. Fourteenth Amendment That language was written specifically to repeal Taney’s declaration that Black people could never be citizens, and it established birthright citizenship as a constitutional principle.
The executive branch had already begun pushing back before the amendments. In 1862, Attorney General Edward Bates issued a formal legal opinion declaring that being Black did not disqualify a person from citizenship, arguing that the Constitution nowhere defined citizenship as requiring whiteness. The opinion signaled a decisive break from the Taney Court’s reasoning, but only the constitutional amendments made the repudiation permanent.
What Happened to Dred Scott
Scott never benefited from the political upheaval his case set in motion. Shortly after the ruling in March 1857, he and his family were transferred to the sons of Peter Blow, the family that had originally enslaved him. The Blow family freed them. Scott worked as a porter in St. Louis and died of tuberculosis in September 1858, about eighteen months after the decision that bears his name. The constitutional amendments that finally answered the Court would not come for another seven years.