Executive Order 9066 affected Japanese Americans by authorizing the forced relocation and internment of more than 120,000 Japanese Americans, including both citizens and non-citizens, to internment camps during World War II.
One way in which the order violated their constitutional rights was by denying them due process of law. Japanese Americans were not given a fair hearing or trial before being forcibly removed from their homes and sent to internment camps. Additionally, their property was often seized or sold without their consent, violating their right to own property.
The order was later deemed unconstitutional by the Supreme Court in the landmark case of Korematsu v. United States (1944), which ruled that the internment of Japanese Americans was not based on military necessity and was instead motivated by racism and prejudice.