Atrios has a great series of posts on the internment of Japanese during WWII. Included is a link to a 1941 propaganda movie justifying the camps.
“But of course the non-assimilation argument was made repeatedly in ’41 against Japanese-Americans. Why did they have pictures of the Emperor up in the parlor? The two most oft repeated characterizations of them was that they were servile and sneaky, and standoffish and arrogant. Such is prejudice. Exclusion begets exclusion, until one set of peoples gets excluded from humanness itself.”