The Germans considered the Jews to be behind the rise of Bolshevism, the worst desaster ever happened to mankind. They accused the Jews of wanting to bolshevize the entire planet, starting with Europe. They wanted to do something against it and decided to deport the cause of what they saw as the source of evil.
The Japanese attacked the US (provoked by the US but that's another story). So what did the US authorities do? This:
http://www.cwporter.com/SCAN 40/beeld-25.jpg
They behaved exactly in the same manner.
You know what this is?
http://static.howstuffworks.com/gif/japanese-internment-camp-3.jpg
Dachau? Auschwitz? Looks like it indeed. But here is what it really is:
The housing barracks, built by the U.S. Army engineer corps, at the internment center where Japanese Americans are relocated in Amache, Colo., are shown on June 21, 1943.
ACLU stood almost alone in denouncing US concentration camps more than 110,000 Americans
http://www.mysaline.com/forum/topics/aclu-stood-almost-alone-in
This doesn't get a very prominent place in history. After all it is the victor who writes history. But the US will not be much of victor soon, so we get the opportunity to give things a second look.