Korematsu v. United States is the 1944 Supreme Court decision that upheld the wartime exclusion of people of Japanese ancestry from the West Coast, allowing the forced removal and incarceration of roughly 120,000 people, about two-thirds of them American citizens. The Court ruled 6-3 that military necessity justified a racial classification that would otherwise be unconstitutional. Fred Korematsu’s own conviction was vacated in 1984 after evidence emerged that the government had misled the Court, and in 2018 Chief Justice John Roberts wrote that the decision was “gravely wrong the day it was decided” and had “no place in law under the Constitution.”1Supreme Court of the United States. Trump v. Hawaii, 585 U.S. (2018)
The Orders Behind the Case
Two months after Pearl Harbor, President Franklin D. Roosevelt signed Executive Order 9066 on February 19, 1942. It authorized the Secretary of War and military commanders to designate zones from which any person could be excluded.2National Archives. Executive Order 9066: Resulting in Japanese-American Incarceration The text never mentioned Japanese Americans. In practice, it targeted almost no one else.
Military authorities carved the West Coast into restricted zones, imposed curfews on all people of Japanese descent, and then ordered them to report to assembly centers for transport to inland camps.3Federal Register. Day of Remembrance of Japanese American Incarceration During World War II Congress backed the order less than a month later with Public Law 77-503, making it a federal misdemeanor to violate any military restriction on civilians issued under the order.4Congress.gov. ArtII.S2.C1.1.4 Evacuation of the West Coast Japanese That statute is what let prosecutors charge anyone who refused to comply.
Fred Korematsu and the Path to the Supreme Court
Fred Korematsu was 23 years old, a U.S. citizen born in Oakland. When his family reported to an assembly center in May 1942, he stayed behind. On May 30, 1942, he was arrested for violating Civilian Exclusion Order No. 34, which required all persons of Japanese ancestry to leave the San Leandro military area after May 9, 1942.5Congress.gov. S. 338 – Fred Korematsu Congressional Gold Medal Act of 2025
In jail, Korematsu agreed to let the American Civil Liberties Union turn his case into a constitutional challenge.6United States Courts. Facts and Case Summary – Korematsu v. U.S. A federal district court convicted him on September 8, 1942, sentencing him to five years of probation.5Congress.gov. S. 338 – Fred Korematsu Congressional Gold Medal Act of 2025 His argument was straightforward: the exclusion order took his liberty without due process and without any showing that he personally posed a threat.
What the Majority Held
Justice Hugo Black wrote for the majority, joined by Justices Stone, Reed, Douglas, and Rutledge, with Justice Frankfurter concurring. The opinion opened with language that would outlive the decision itself: “all legal restrictions which curtail the civil rights of a single racial group are immediately suspect” and must face “the most rigid scrutiny.”7Justia. Korematsu v. United States That sentence is the origin of what constitutional law now calls strict scrutiny.
Having announced the highest standard of judicial review, the majority concluded the government cleared it. The Court deferred to the military’s judgment that Japanese Americans on the West Coast posed a risk of espionage and sabotage after Pearl Harbor. Justice Black wrote that the exclusion was driven by military urgency rather than racial prejudice, and reasoned that individual loyalty hearings for over a hundred thousand people were impractical while invasion seemed possible. Korematsu’s conviction stood.
The tension is right on the surface of the opinion. The case that first said racial classifications are “immediately suspect” applied that rule and still approved mass incarceration based on race.
The Three Dissents
Justice Frank Murphy called the exclusion “the legalization of racism.” He argued that the military’s justification rested on stereotypes rather than evidence, and pointed out that German Americans and Italian Americans faced nothing comparable even though the United States was at war with their ancestral countries as well. Individual investigations, he wrote, could have addressed any real threat.
Justice Robert Jackson’s dissent looked past the war. He accepted that courts often cannot stop the military from acting unconstitutionally in an emergency, but argued that ratifying such actions in a judicial opinion was worse than the actions themselves, because a military order expires and a Supreme Court opinion does not. His warning has become one of the most quoted passages in constitutional law: once the Court validates a racial classification, “the principle then lies about like a loaded weapon ready for the hand of any authority that can bring forward a plausible claim of an urgent need.”8Legal Information Institute. Korematsu v. United States
Justice Owen Roberts took a narrower angle. Korematsu had been caught between two military orders: one told him to leave the area, another told him to report to an center and not leave. Obeying either meant violating the other. Roberts saw a plain deprivation of constitutional rights with no legitimate justification.
How Korematsu’s Conviction Was Vacated
The decision stood largely unchallenged in court for four decades. In the early 1980s, legal historian Peter Irons and researcher Aiko Herzig-Yoshinaga uncovered documents showing the government had deliberately misled the Supreme Court. Intelligence reports from the FBI and the Office of Naval Intelligence had contradicted the military’s claims of a security threat. A report by Lt. Commander K.D. Ringle of Naval Intelligence estimated that fewer than 300 Japanese Americans nationwide might warrant any security concern and recommended handling the situation on an individual basis. None of this material reached the justices in 1944.
Korematsu filed a petition for a writ of coram nobis on January 19, 1983. Coram nobis is a rare procedure that lets a court correct a fundamental error in a past conviction after the sentence has been served. On April 19, 1984, Judge Marilyn Hall Patel of the U.S. District Court for the Northern District of California vacated the conviction, finding that the government had suppressed evidence and misled the courts, amounting to a fraud upon the judicial system.9Justia. Korematsu v. United States, 584 F. Supp. 140610Justia. Gordon K. Hirabayashi v. United States11Justia. Minoru Yasui v. United States of America
Vacating Korematsu’s conviction did not overturn the Supreme Court precedent. It cleared the defendant, not the case.
The Civil Liberties Act of 1988
Congress addressed the broader injustice through legislation. In 1980, it created the Commission on Wartime Relocation and Internment of Civilians, whose 1983 report concluded that Executive Order 9066 was not justified by military necessity and attributed the incarceration to racial prejudice, wartime hysteria, and a failure of political leadership.
The Civil Liberties Act of 1988 followed. Congress declared that “a grave injustice was done” to citizens and permanent residents of Japanese ancestry, acknowledged that the internment stemmed from racism rather than security concerns, and issued a formal apology.12Congress.gov. H.R.442 – Civil Liberties Act of 1987 The law directed the Attorney General to pay $20,000 to each surviving internee and asked the President to pardon those convicted for resisting the internment orders.13Office of the Law Revision Counsel. United States Code Title 50 Chapter 52 Subchapter 1 – Restitution More than 82,000 people ultimately received payments.
The 2018 Repudiation in Trump v. Hawaii
The Supreme Court never granted the case a formal reversal in the way it did with Plessy v. Ferguson, and for decades scholars debated whether Korematsu remained good law. That question was answered in 2018.
In Trump v. Hawaii, the Court upheld a presidential proclamation restricting entry from several majority-Muslim countries. The dissent drew a parallel to the Japanese American exclusion. Chief Justice Roberts used the comparison to address Korematsu directly, writing that the 1944 decision “was gravely wrong the day it was decided, has been overruled in the court of history, and—to be clear—’has no place in law under the Constitution.'”1Supreme Court of the United States. Trump v. Hawaii, 585 U.S. (2018) The closing phrase quoted Justice Jackson’s original dissent.
What the Case Left Behind
Korematsu left two contradictory marks on constitutional law. It established strict scrutiny as the standard for evaluating racial classifications, the tool later courts used against segregation and other forms of official discrimination. It also showed that even the strictest standard of review can fail when courts defer too readily to claims of military necessity. The distance between the rule the majority announced and the result it reached is one of the sharpest examples in American law of constitutional protections collapsing under wartime pressure, and Jackson’s “loaded weapon” line remains the most cited warning about what that gap can cost.