There is a great website for Japanese American Internment Curriculum by National Japanese American Historical Society. This site provides lesson plans, documents, and useful links for K-12 teachers. http://bss.sfsu.edu/internment/lessonplans.html
I was there several times at the 'Japanese American National Museum' located in the middle of Little Tokyo. There are a packet for teachers to take home, plus for my class use, they even helps me to make copy of some of their exhibits. Great resources. http://www.janm.org/