[jdsteel]

And the fact that the Japanese SAID that all of the Japanese in the US would rise up against us. That had something to do with it.

[Verginius Rufus]

Only those born in the US were citizens--Japanese immigrants were not allowed to become naturalized citizens, and a large percentage of those interned were enemy aliens (many of whom may have wished to become US citizens). The Japanese in Hawaii were not all interned, or those in the eastern US.

The government knew there were some dangerous individuals among that population (a small minority) but they couldn't reveal it because then the Japanese government would learn that we had broken their code.

In World War I, Australia and New Zealand put immigrants from Austria-Hungary in concentration camps, even those who had become naturalized and were willing to fight for the British Empire.