The Dred Scott case, decided by the U.S. Supreme Court in March 1857 as Dred Scott v. Sandford, ruled 7–2 that people of African descent could not be citizens of the United States and had no right to sue in federal court, and it struck down the Missouri Compromise by holding that Congress could not ban slavery in federal territories.1National Archives. Dred Scott v. Sandford (1857) Widely considered the worst ruling the Court has ever issued, it deepened the national crisis over slavery, helped push the country into civil war, and was directly overturned by the 13th and 14th Amendments.
Who Dred Scott Was and Why He Sued
Dred Scott was born enslaved around 1799 in Southampton County, Virginia, to the Peter Blow family. In 1833, the Blows sold him to Dr. John Emerson, a U.S. Army surgeon whose postings moved Scott across the country and, critically, into places where slavery was illegal.2National Park Service. Dred Scott
Emerson first took Scott to Fort Armstrong at Rock Island, Illinois, a free state. In 1836, he was reassigned to Fort Snelling, in what is now Minnesota but was then part of the Wisconsin Territory, where slavery was banned under the Missouri Compromise of 1820.2National Park Service. Dred Scott At Fort Snelling, Scott married Harriet Robinson, and the couple later had two daughters, Eliza and Lizzie. The family eventually returned with Emerson to Missouri, a slave state. Emerson died in 1843, and ownership passed to his widow, Irene Emerson. In 1846, Dred and Harriet Scott sued for their freedom.
Their claim rested on a well-established Missouri doctrine known as “once free, always free.” Under an 1824 Missouri Supreme Court ruling, an enslaved person who had lived in a free state or territory was considered permanently free, even after returning to a slave state.3Missouri Secretary of State. Before Dred Scott: Freedom Suits in Antebellum Missouri Scott’s years in Illinois and at Fort Snelling gave him strong ground under that doctrine, and Missouri territorial law dating to 1807 gave enslaved people a specific right to petition for freedom in court.
How the Case Reached the Supreme Court
The Scotts filed separate petitions in the St. Louis Circuit Court in 1846. A jury eventually ruled in 1850 that they should be free. Irene Emerson appealed, and in March 1852 the Missouri Supreme Court reversed by a 2–1 vote, breaking with decades of precedent. Justice William Scott wrote that “times now are not as they were when the former decisions on this subject were made,” and held that Missouri had no obligation to honor the antislavery laws of other jurisdictions.4Missouri Secretary of State. Missouri’s Dred Scott Case, 1846-1857 The “once free, always free” rule was effectively dead in Missouri.
Scott’s lawyers moved to federal court. They sued John F.A. Sanford, Irene Emerson’s brother, who was involved in managing the Emerson estate. Because Sanford lived in New York and Scott claimed Missouri citizenship, the case qualified for diversity jurisdiction, which lets federal courts hear disputes between citizens of different states.5Justia U.S. Supreme Court Center. Dred Scott v. Sandford The federal circuit court ruled against Scott, and the case went up to the Supreme Court.
The Supreme Court’s Ruling on Citizenship
Chief Justice Roger B. Taney delivered the majority opinion in March 1857, joined by six other justices. Rather than deciding narrowly whether Scott was free, Taney reached the broadest possible questions about race, citizenship, and congressional power.
The central holding was blunt: no person of African descent, whether free or enslaved, could be a citizen of the United States under the Constitution. Taney argued that when the framers used the word “citizen,” they did not include Black people, who he claimed “were not regarded in any of the States as members of the community which constituted the State, and were not numbered among its ‘people or citizens.'”1National Archives. Dred Scott v. Sandford (1857) Because Scott was not a citizen, the Court held, he had no standing to sue in federal court.
That was a jurisdictional ruling. It should have ended the matter. Taney went further.
Striking Down the Missouri Compromise
Even after finding that Scott lacked standing, Taney ruled on whether Congress could prohibit slavery in federal territories. The Missouri Compromise of 1820 had banned slavery in the Louisiana Purchase territory north of the 36°30′ parallel, with Missouri itself as an exception. Fort Snelling, where Scott had lived, fell within that free zone.
Taney declared the Missouri Compromise unconstitutional. His reasoning rested on the Fifth Amendment’s Due Process Clause: because enslaved people were legally classified as property, Congress could not deprive slaveholders of that property in the territories without due process. Any federal statute banning slavery in a territory was, on that view, an unconstitutional taking.5Justia U.S. Supreme Court Center. Dred Scott v. Sandford It was only the second time the Supreme Court had struck down an act of Congress; the first was Marbury v. Madison in 1803.
The practical effect was enormous. If Congress could not ban slavery in the territories, the framework of legislative compromise that had held the Union together for decades was invalid. The ruling also cast doubt on the Kansas-Nebraska Act of 1854, which had replaced the Missouri Compromise with “popular sovereignty” and let territorial settlers vote on slavery. If Congress could not restrict slavery in the territories, it was unclear whether it could delegate that power either.1National Archives. Dred Scott v. Sandford (1857)
The Dissents
Two justices dissented. Justice Benjamin Curtis attacked Taney’s history directly, pointing out that at the time the Constitution was ratified, at least five states allowed free Black men to vote. If they voted, they were citizens of their states and therefore citizens of the United States. Taney’s claim that the founders uniformly excluded Black people from citizenship was wrong as a matter of historical fact. Curtis also argued that Congress plainly had authority to govern the territories and regulate slavery within them, a power exercised since the Northwest Ordinance of 1787. His dissent was so forceful that it leaked to a Boston newspaper before the majority opinion was even published, and the feud with Taney grew bitter enough that Curtis resigned from the Court later that year.
Justice John McLean defended the “once free, always free” doctrine and argued that slavery was contrary to natural law. He insisted residence in free territory genuinely changed an enslaved person’s status, and that Missouri courts had recognized as much for decades before reversing course in Scott’s case.6National Park Service. Dred Scott Case Trials
Political Fallout and the Road to Civil War
Far from settling the slavery question, the decision inflamed it. Northern opponents of slavery read the ruling as proof that slaveholding interests controlled the federal government, judiciary included. It became a focal point of the 1858 Lincoln-Douglas debates in Illinois, where Abraham Lincoln argued the decision was part of a broader effort to make slavery legal everywhere, and warned that a future ruling could stop even free states from banning slavery within their own borders. Lincoln pressed Stephen Douglas on the contradiction between the ruling and popular sovereignty: if Congress could not exclude slavery from a territory, how could settlers? Douglas answered that settlers could effectively exclude it by refusing to pass local laws protecting it, an answer that satisfied neither side.
By 1860, the Republican Party built its presidential platform around direct opposition to the decision, calling the notion that the Constitution automatically carried slavery into every territory “a dangerous political heresy” that was “revolutionary in its tendency, and subversive of the peace and harmony of the country.” Lincoln won the presidency on that platform without carrying a single Southern state. Secession and civil war followed within months.
Scott himself lived as a free man only briefly. After the ruling, Irene Emerson, by then remarried to a Northern congressman named Calvin Chaffee, transferred ownership of the Scott family back to the sons of Peter Blow. The Blows freed Dred and Harriet Scott in May 1857, two months after the decision.2National Park Service. Dred Scott Dred Scott died of tuberculosis in St. Louis in September 1858, about sixteen months after gaining his freedom.
How the 13th and 14th Amendments Overturned the Ruling
The Civil War and the amendments that followed dismantled every major holding in the case. The 13th Amendment, ratified on December 6, 1865, abolished slavery, 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.”7National Archives. 13th Amendment to the U.S. Constitution: Abolition of Slavery That destroyed the legal foundation of Taney’s reasoning: there could be no Fifth Amendment property right in enslaved people if slavery itself was unconstitutional.
The 14th Amendment, ratified in 1868, targeted the citizenship holding directly. Its opening words are unambiguous: “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.”8Congress.gov. Fourteenth Amendment The Citizenship Clause was written specifically to overrule Taney’s holding that people of African descent could never be American citizens.1National Archives. Dred Scott v. Sandford (1857) Birthright citizenship, the principle that anyone born on American soil is automatically a citizen, sits in the Constitution today because of how badly the Dred Scott decision needed to be undone.