EXECUTIVE ORDER NO. 9066 (excerpt)
Authorizing the Secretary of War to Prescribe Military Areas
"Whereas, The successful prosecution of the war requires every possible protection against espionage and against sabotage to national defense material, national defense premises and national defense utilities... Now, therefore, by virtue of the authority vested in me as President of the United States, and Commander in Chief of the Army and Navy, l hereby authorized and direct the Secretary of War, and the Military Commanders whom he may from time to time designate, whenever he or any 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..."
Franklin D. Roosevelt The White House,
Documents Section: Japanese
American Internment Curriculum.