<span>C.) three months after Pearl Harbor, in the California desert. </span>Japan’s attack on Pearl Harbor December 7, 1941. n February, 1942, President Franklin D. Roosevelt signed Executive Order 9066 authorizing the Secretary of War to establish Military Areas and to remove from those areas anyone who might threaten the war effort. <span>Manzanar, located in the Owens Valley of California between the Sierra Nevada on the west and the Inyo mountains on the east, was typical in many ways of the 10 camps.</span>