"Concentration camp" just means a place where a large number of members of a certain demographic are kept.
Exactly. And, at the first, the German camps weren't all that awful. Prisoners worked, just as they do in most prisons. They were fed, ect. Then, once the war started and Germany began losing (which, really, didn't take all that long) conditions in the camps started getting bad. Hitler ordered the "final solution," partly as punishment for what Germany was enduring and partly with the idea that, even if Germany lost, at least the hated Jews would be gone.
I can see the same thing happening to the Japanese Americans in the (highly unlikely) event the US started losing the war. Certainly, if the Fundies ever gain real political power, life will get very hard for homosexuals, atheists, and anyone of the "wrong" belief system.