People were just mad racist...federal treatment of the Japanese
Americans was one of the few ways that Americans focused on national
issues during WWII, rather than international. The availabilty of jobs
and decreased economic pressure brought up civil rights issues for the
African Americans (less widespread depression, more concentrated in
African American and Mexican American socities). But remember how
German culture was rejected in America during WWI? A lot of animosity
towards the Japanese probably stemmed from the national idea that
Japanese were the enemy, and why would Americans want their culture or
their people to have any part in American society? An attack on the
Japanese immigrants and Japanese Americans was the only way Americans
could bring WWII on to their soil, uniting Americans behind defeating a
more recognizable enemy.