人は外の広い世界を知らずに、自分の経験で物事を判断する (Hito wa soto no hiroi sekai o shirazu ni, jibun no keiken de monogoto o handan suru.) – “People judge things by their own experience, not knowing of the wide world outside.”
Prejudice toward the Japanese dates back to the Progressive Era, where children in schools were taught that the Japanese were a natural enemy, using the Japanese victory over Russia in 1905 as an example. 1913 saw the passing of the Asian Land Law, which forbid Japanese from owning land on the Delta, while 1919 saw the creation of a statewide anti-Japanese organization that opposed Japanese farmers taking over orchards and Delta farms.
This bigotry became amplified after the attack on Pearl Harbor. Wild conspiracy theories would circulate (sound familiar?) regarding Japanese spies using light signals, which eventually led to Executive Order 9066, issued on February 19, 1942. EO 9066—which was heavily supported by politicians and officials including Attorney General Earl Warren—ordered the immediate interment of all Japanese immigrants in the US. Between 110,000 and 120,000 men, women, and children were incarcerated and relocated to internment camps across the country. Businesses were boarded up, families were split, and lives were forever traumatically altered.