Korematsu v. United States was a landmark Supreme Court case decided in 1944 that upheld the constitutionality of the internment of Japanese Americans during World War II. The ruling came in response to Executive Order 9066, which authorized the forced relocation and incarceration of individuals of Japanese descent in camps across the United States, reflecting the government's wartime fears of espionage and sabotage. This case has become a critical example in discussions about civil liberties, racial discrimination, and government overreach during times of national crisis.