The Quebec agreement was a secret agreement between the United Kingdom and the United States, which defined the conditions for the coordinated development of science and technology in the field of nuclear energy, and in particular nuclear weapons. August 1943, during the Second World War, at the First Quebec Conference in Quebec, Canada. On August 17, 1940, Roosevelt met Canadian Prime Minister William Lyon Mackenzie King in a private wagon near Ogdensburg, New York. Roosevelt devised an agreement to be signed by King and established a permanent board of directors responsible for the joint defence of the two countries. It became known as the Ogdensburg Accord. Truman, who succeeded Roosevelt after his death on April 12, 1945, Clement Attlee, who had replaced Churchill in July 1945 as Prime Minister, handed Over Anderson and U.S. Secretary of State James F. Byrnes on a boat cruise on the Potomac River and agreed to revise the Quebec agreement to replace it with a looser form of nuclear cooperation between the three governments.  Groves, Minister of War Robert P. Patterson and Patterson Advisor George L. Harrison met on November 15, 1945 with a British delegation consisting of Anderson, Wilson, Malcolm MacDonald, the High Commissioner for Canada, Roger Makins of the British Embassy in Washington and Denis Rickett, Anderson`s assistant, to draft a press release. They agreed to maintain the combined policy commission.
The Quebec agreement`s requirement for “mutual consent” before the use of nuclear weapons has been replaced by “prior consultation” and there should be “full and effective cooperation in the field of atomic energy,” but in the long protocol of intent signed by Groves and Anderson, it was only “in the field of basic scientific research.” Patterson sent the communiqué to the White House, where Truman and Attlee signed it on November 16, 1945.  A draft agreement was approved on December 4, 1945 by the Combined Policy Committee as the basis for the revocation of the Quebec Agreement.  Canada-U.S. Economic Agreement, signed by Roosevelt and Mackenzie King on April 20, 1941 in Hyde Park, the home of the U.S. President on the Hudson River. … Anderson devised a comprehensive exchange agreement that reformulates Churchill “in more majestic language.”  Anderson feared that Groves Stimson and Bush would say that “like all Americans who come to our island, they were greeted by our hypocritical cunning and carried away by our brilliant Prime Minister.”  When Conant learned of the agreement, he stated that he would feel more at home in the staff of the Chicago Tribune, a newspaper known for its anti-British views.  Anderson arrived in Washington on August 5 with the project and moved on with Conant and Bush. From an American point of view, nothing came to the final draft, which was the opposite of the current information exchange policy.
Anderson made an important concession: the creation of the Combined Policy Committee, which oversees the joint project with representations from the United States, the United Kingdom and Canada.  Coant`s objections to Anderson`s proposed information-sharing settlement were accomplished by assigning the task to the Combined Policy Committee.  Stimson, General George Marshall and Rear Admiral William R.