After December 7th, 1941 people of Japanese, German, and Italian descent, the majority were U.S. citizens, were relocated. Those suspected of cooperating with the enemy were interned in separate camps Japanese I think mostly in northern California. Those relocated were moved to places in several of the states. One was Jerome War Relocation Center in Arkansas. wiki source, picture of girl on way to school
Jerome War Relocation Center in Arkansas
Even though many were constantly struggling to make a living in this new reality they had been forced into, the internees left a positive mark on the local community. They showed the locals new methods of crop irrigation, impressed teachers with their hard-work in the classroom, and created distinctive art pieces that reflected their Japanese heritage.
Many citizens left the relocation centers and joined the Military to fight in Europe I believe.
I think that it's important to understand that should it become necessary again only Islamists would be interned. At least the individual has the choice.
I think you bring this up now because Mark Levin mentioned the Japanese internment/relocation by order of Franklin D. Roosevelt in 1942 on his show tonight. This was just one item in his fabulous history of racism and bigotry in the Democratic Party beginning in the early 1800s and extending down today in the era of Obama.
I would recommend a podcast of tonight's show to those who missed it.
As for the Roosevelt Administration's handling of Japanese Americans during WWII, I believe it included those who had resided not only in northern California, but just about the entire West. All the camps for relocation were located in the Western states, except for the one in Arkansas.
The program was originally ruled constitutional by the SCOTUS, but that ruling was overturned shortly after WWII. IIRC, the federal government was ordered to pay large sums in damages to the individuals and their families who were coercively relocated during this period.
I believe those of German or Italian ethnicity who were interned/relocated were selected based upon an index of individual suspicion of having connections to the enemy regimes, in contrast to the Japanese.