Lester Pearson was Minister for External Affairs between 1948 and 1957. During this time Canada was a member of two successive United Nations commissions on eliminating or controlling nuclear arms with the United States and the Soviet Union as the main negotiators. The goal of these discussions was to reach an agreement on general principles that reflected the strategic needs of each side, rather than on the technical details necessary for a treaty. While the United States and the Soviet Union played the largest role in the negotiations, two other major powers, Britain and France, allies of the Americans, were also at the bargaining table. Canada was the only middle power to participate in all negotiations.

In Pearson and Canada's Role in Nuclear Disarmament and Arms Control Negotiations Joseph Levitt traces the history of these negotiations from the Canadian diplomatic perspective. He analyses the various proposals and documents the reactions of Pearson and his colleagues. Levitt reveals Pearson's own view of the strategic stalemate between the USSR and the United States -- Pearson did not believe that an open and liberal society such as the United States would ever launch an unprovoked offensive on the USSR; he thought instead that the danger of a major military confrontation arose only from the possibility that the Soviet Union might attack. Consequently the main thrust of Canadian diplomatic activity in these negotiations was not prevention of an American arms build-up but support of a strategy which would compel the USSR to accept an agreement that would benefit the Americans militarily or, failing that, to hold the Soviets responsible for the impasse in the talks and thus win the all-important propaganda war.