There was real fear among the populace, especially on the West Coast, that Japan would attempt an invasion. Instead of putting in the effort to alleviate those fears, the government, in its infinite wisdom, decided to intern these people. Of course it didn't help that they "looked" different and so therefore "could not be trusted".
The sad thing is it could easily happen again. During a state of war or rebellion the President can suspend
habeas corpus indefinitely.
From Article I, Section 9 of the Constitution:
Quote:
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The privilege of the writ of habeas corpus shall not be suspended, unless when in cases of rebellion or invasion, the public safety may require it.
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Roosevelt's decision was upheld in several Supreme Court rulings.
Lincoln suspended
habeas corpus in the Civil War as well.