A great majority of Japanese Americans interned at Manzanar were American citizens by birth. President Roosevelt's executive order took freedom away from these "American citizens" just like that, without even going through a fair process. This was basically because people believed that Japanese descent had something to do with this.
Manzanar’s internees suffered from the harsh weather conditions in the desert. Temperatures were as high as 110º F in the summer and frequently dropped below freezing in the winter. Besides this, "The temporary, tar paper-covered barracks, and the guard towers" showed how badly the Japanese Americans were treated in the internment camps.
If you look at this carefully, you will notice this is also a form of racism because they were judged because of how they looked and a false belief that they would do something wrong. They were also judged for something their "mother country" did.