Korematsu v. United States occurred when Korematsu an American son of Japanese immigrants refused to leave his residence, when the American government decided to relocate all Japanese and Japanese descendants to concentration camps during World War II.
Korematsu claimed to be an American citizen and that his constitutional rights were being denied, but it was decided that the US government was free to give the military the power to nullify any civil and constitutional rights in times of war if that were a necessity for the US security.
