The Dred Scott decision, handed down March 6, 1857, did three things in a single 7–2 opinion: it declared that Black people, whether enslaved or free, were not citizens of the United States and could not sue in federal court; it struck down the Missouri Compromise of 1820 as unconstitutional; and it held that the Fifth Amendment protected a slaveholder’s right to carry enslaved people into any federal territory. What the Dred Scott decision did, in short, was constitutionalize slavery’s expansion and slam the federal courthouse door on an entire race. It stood as binding law until the Civil War and three constitutional amendments dismantled it.1National Archives. Dred Scott v. Sandford (1857)
The Case in One Paragraph
Dred Scott was an enslaved man whose owner, army surgeon Dr. John Emerson, had taken him from Missouri to the free state of Illinois and later to Fort Snelling in the northern Louisiana Purchase territory, where the Missouri Compromise banned slavery.2Legal Information Institute. Dred Scott, Plaintiff in Error, v. John F. A. Sandford In 1846, Scott and his wife Harriet sued for their freedom in St. Louis, arguing that years of residence on free soil had made them legally free.1National Archives. Dred Scott v. Sandford (1857) Eleven years later, their case reached a Supreme Court that used it to try to settle the national fight over slavery.
It Denied Citizenship to Every Black American
Chief Justice Roger Taney, writing for the majority, held that no person of African descent qualified as a “citizen” under the Constitution. That closed the federal courts to Black litigants, because federal diversity jurisdiction depends on the parties being citizens of different states.3Constitution Annotated. ArtIII.S2.C1.16.1 Overview of Diversity Jurisdiction
Taney’s reasoning was historical. He argued that the framers had viewed Black people as a separate class with no political or legal rights that white society was obligated to respect, and therefore never intended to include people of African ancestry in the word “citizens.” A state could grant local citizenship, Taney wrote, but that status carried no weight in federal courts or under the federal Constitution.
The practical effect was staggering. Every Black person in America, whether born free, freed by a former owner, or recognized as a citizen by a northern state, was barred from filing a federal lawsuit. Ancestry alone shut the door. This holding alone should have ended the case, since the Court had just declared it lacked jurisdiction. Taney pressed on anyway.
It Struck Down the Missouri Compromise
The second holding erased the federal law that had prohibited slavery in the northern portions of the Louisiana Purchase.4National Archives. Missouri Compromise (1820) The Court ruled Congress had no constitutional authority to ban slavery in federal territories.
Taney built the conclusion on a narrow reading of the Territory Clause in Article IV, which gives Congress power to “make all needful Rules and Regulations” for U.S. territories.5Constitution Annotated. Territory and Other Property He argued the clause reached only territory the United States held when the Constitution was ratified in 1788, not land acquired later. Because the Louisiana Purchase came in 1803, Congress supposedly had no authority to regulate slavery there.
It was only the second time the Supreme Court had struck down an act of Congress. The first was Marbury v. Madison in 1803, more than fifty years earlier.6Federal Judicial Center. Marbury v. Madison (1803) Decades of congressional compromises that had managed slavery’s expansion into the West lost their legal foundation overnight. Slaveholders could now take enslaved people into any federal territory without restriction.
It Turned the Fifth Amendment Into a Shield for Slaveholders
The engine driving the Missouri Compromise ruling was the Due Process Clause of the Fifth Amendment, which forbids the federal government from depriving any person of life, liberty, or property without due process of law. Taney treated enslaved people as property indistinguishable from any other private wealth. A federal law banning slavery in a territory, on that logic, amounted to seizing a citizen’s property because he had crossed a geographic line.
The opinion was blunt. Taney wrote that the right to hold property in enslaved people was “distinctly and expressly affirmed in the Constitution” and that no branch of government could draw a distinction between slave property and any other kind. Congress could not strip a slaveholder of this property through territorial legislation any more than it could confiscate land or goods without legal process.1National Archives. Dred Scott v. Sandford (1857)
The reasoning reframed the entire slavery debate. If enslaved people were constitutionally protected property, then any federal restriction on slavery was arguably unconstitutional, and abolitionists feared the same logic could eventually reach into free states that banned slavery within their own borders.
What It Meant for the Scott Family
The outcome for the Scotts was foreordained by the reasoning above. A lower-court jury had found that Dred, Harriet, and their daughters Eliza and Lizzie were “negro slaves, the lawful property of the defendant,” and the Supreme Court left that finding undisturbed.2Legal Information Institute. Dred Scott, Plaintiff in Error, v. John F. A. Sandford Because Congress could not ban slavery in the territory and Scott was not a citizen entitled to sue, his years on free soil counted for nothing. The Court sent the case back with instructions to dismiss.
In a grim coda, the Scott family was transferred back to the Blow family, early supporters of the legal fight, who freed them in May 1857, two months after the ruling. Dred Scott died of tuberculosis that September, having lived as a free man for only a few months.7National Museum of African American History and Culture. The Human Factor of History: Dred Scott and Roger B. Taney
The Dissents
Justices Benjamin Curtis and John McLean dissented sharply. Curtis attacked the citizenship holding at its root, pointing to the historical record showing that free Black men had been recognized as citizens in several states when the Constitution was ratified. If they were state citizens in 1788, Curtis argued, they were necessarily among the “people of the United States” who ordained the document. On the territorial question, he concluded the Missouri Compromise was a lawful exercise of congressional authority.
McLean rejected the majority’s treatment of enslaved people as ordinary property. He wrote that “a slave is not a mere chattel” and bore “the impress of his Maker.” He also invoked well-established precedent that a slaveholder who brought an enslaved person to reside in a free jurisdiction emancipated that person, meaning Scott became free at Fort Snelling and stayed free on return to Missouri. The majority, McLean said, had abandoned decades of consistent precedent to reach a political result.
The Political Fallout
Taney and the majority apparently hoped the ruling would settle the slavery question by placing it beyond the reach of Congress. It did the opposite, pushing the country a step closer to civil war.1National Archives. Dred Scott v. Sandford (1857)
Opponents of slavery read the decision as saying the Constitution not only tolerated slavery but required the federal government to protect it everywhere. Anti-slavery politicians, including Abraham Lincoln, used the ruling to build support for the newly formed Republican Party. Lincoln argued that the logic of the decision, followed to its end, meant no state could exclude slavery, effectively nationalizing the institution.
For slavery’s defenders, the ruling was a vindication that backfired. It convinced much of the North that slaveholders had captured the Supreme Court. The political middle ground that congressional compromises had held for decades collapsed. Within four years, the nation was at war.
How the Decision Was Overturned
No later court ruling reversed Dred Scott. Constitutional amendments did. The Thirteenth Amendment, ratified in 1865, abolished slavery outright, declaring that “neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States.”8Congress.gov. Thirteenth Amendment That removed the legal category of human property on which Taney’s Fifth Amendment argument depended.
The Fourteenth Amendment, ratified in 1868, directly repudiated the citizenship holding. Its opening sentence grants citizenship to “all persons born or naturalized in the United States, and subject to the jurisdiction thereof.” The Supreme Court affirmed this principle in United States v. Wong Kim Ark (1898), confirming that anyone born on American soil is a citizen regardless of parents’ nationality or race. The Fifteenth Amendment, ratified in 1870, added the right to vote regardless of race.
Where Dred Scott Stands Today
Legal scholars place Dred Scott v. Sandford in what they call the “anti-canon,” a small group of Supreme Court decisions universally recognized as grievous mistakes. It sits alongside Plessy v. Ferguson, which upheld racial segregation, and Korematsu v. United States, which approved Japanese American internment. Modern courts do not cite Dred Scott as authority for anything. When it appears in opinions, it serves as a cautionary reference.
The case is also a reminder that Supreme Court rulings are not self-correcting. Dred Scott stood as binding law for more than a decade, and undoing it took a war that killed more than 600,000 people and three constitutional amendments. No subsequent court decision overruled it because no court decision could have repaired the damage. The Constitution itself had to be rewritten.