United States Department of State
In the conduct of foreign relations, the President, though ultimately responsible to the people for the general success or failure of such conduct, is unable, of course, to give his personal attention to any except what he deems to ,be the most important and momentous questions of policy. For handling the great mass of routine matters and even for the determination of many questions of policy which are of considerable importance, he is dependent upon the assistance of the agencies supplied for that purpose. These agencies are, principally, the department of state, the diplomatic service, and the consular service. These three agencies are, in reality, parts of one whole, which has its head office in Washington and its agents in every part of the world. For purposes of conveniefice, however, they may be separately considered.