Shortly after Japan launched its surprise attack on Naval Station Pearl Harbor on December 7th, 1941, President Roosevelt signed Executive Order 9066, resulting in over 100k West Coast citizens and residents of Japanese descent into incarceration camps. Racism against Japanese Americans rapidly increased as distrust ballooned. What many Americans failed to realize was that Japanese Americans were also inflamed at the attack on Pearl Harbor. Afterall, they were Americans, too.
Sources:
Go For Broke – National Education Center
nationalww2museum.org/war/articles/442nd-regimental-combat-team
