One final fun fact on this whole internment thing: During World War I, the US required all Germans over the age of 14 to be registered and carry their registration card at all times. They also had to report any change of address or employment to the government. All-in-all, the government arrested over 6,000 Germans and ended up detaining around 2,000 of them for the duration of the war.
Also, J. Edgar Hoover was in charge of the US's Enemy Alien Registration Program that ran the internment camps during World War I. He wasn't even 23 years old yet when he was placed in charge of the program.