Pearl Harbor was attacked by Japan on December 7, 1941; and the United States declared war against Japan on the following day, December 8. Although the said executive order was silent as to its subject group of people, succeeding executive orders and military- police actions seemed to show that it was directed to United States residents with Japanese-descent. Much more, considering that E. O. 9066 was issued just two months after the Pearl Harbor Attack and the subsequent declaration of war by United States against Japan the following day; all these actions and events pointed to the logical conclusion that this E. O. was issued for the establishment of interment camps for the said group of residents.
Though later, there were other nationalities in the said camps, the 110,000 Japanese-descent residents composed the large majority of the detainees. ¦.. ny designated Commander deem such action necessary or desirable to prescribe military areas in such places and of such extent as he or the appropriate Military Commander may determine, from which any or all persons may be excluded, and with respect to which, the right of any person to enter, remain in, or leave shall be subject to whatever restriction the Secretary of War or the appropriate Military Commander may impose in his discretion (from President Franklin Delano Roosevelts Executive Order No. 9066) The military areas mentiond in the said E. O. , clearly referred to interment camps for the Japanese descent residents.
Military areas are usually where large number people are housed. And considering the time and past events when it was issued, these military areas are intended for the Japanese-descent group living in US territories. There were no other groups of people large enough that required the establishment of military areas during those times. The Japanese was not specified in the said E. O. , because there are other war enemies of United States that were potential subjects of the said E. O.. The interment camps in USA remind us of the concentration camps in Germany.
But the difference was that USA interments camps were intended only to isolate potential enemies; or sometimes, just to restrict such persons from entering a military restricted areas- which is about one third of the land area of the United States. While the German concentration camps were designed to exterminate the Jews. Definitely, conditions and treatment in these US interment camps were more humane, than these in the concentration camps in Germany. These facts were proven when all detained or restricted in the said US interment camps were all freed after World War II; while many in these German Concentrations camps were massacred.