Hirabayashi v. United States
Overview
 
Hirabayashi v. United States, 320 U.S. 81
Case citation
Case citation is the system used in many countries to identify the decisions in past court cases, either in special series of books called reporters or law reports, or in a 'neutral' form which will identify a decision wherever it was reported...

 (1943), was a case in which the United States Supreme Court
Supreme Court of the United States
The Supreme Court of the United States is the highest court in the United States. It has ultimate appellate jurisdiction over all state and federal courts, and original jurisdiction over a small range of cases...

 held that the application of curfews against members of a minority group were constitutional when the nation was at war with the country from which that group originated. Yasui v. United States
Yasui v. United States
Yasui v. United States, 320 U.S. 115 was a United States Supreme Court case regarding the constitutionality of curfews used during World War II when they were applied to citizens of the United States. The case arose out of the implementation of Executive Order 9066 by the U.S...

was a companion case decided the same day.
Following the attack
Attack on Pearl Harbor
The attack on Pearl Harbor was a surprise military strike conducted by the Imperial Japanese Navy against the United States naval base at Pearl Harbor, Hawaii, on the morning of December 7, 1941...

 on Pearl Harbor
Pearl Harbor
Pearl Harbor, known to Hawaiians as Puuloa, is a lagoon harbor on the island of Oahu, Hawaii, west of Honolulu. Much of the harbor and surrounding lands is a United States Navy deep-water naval base. It is also the headquarters of the U.S. Pacific Fleet...

, American public opinion initially stood by the large population of Japanese-Americans living on the West Coast, and believed that their loyalty to the United States was unquestionable.
 
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