In addition to these meetings, and in accordance with the agreement at Yalta, the Foreign Ministers of Great Britain, the Soviet Union, and the United States conferred together in San Francisco last spring, in Potsdam in July, in London in September, and in Moscow in December. These meetings have been useful in promoting understanding and agreement among the three governments. Simply to name all the international meetings and conferences is to suggest the size and complexity of the undertaking to prevent international war in which the United States has now enlisted for the duration of history.