Decision making and diplomacy are key elements of twentieth century international history. Focusing particularly on the origins and aftermath of the Second World War, but expanding the scope broadly, this volume includes original papers on the management of British foreign policy between 1914 and 1945; the League of Nations and its impact on national and international diplomacy in the 1930s; the response of key powers to international crises and events such as the Manchurian crisis, the Abyssinian crisis, the Spanish Civil War and the Korean War; the intricacies and significance of conference diplomacy, such as the Geneva Disarmament Conference of 1932-34 and the Anglo-American relations post-1945. Each essay has been specially commissioned to cover an important aspect of decision-making and diplomacy in the twentieth century which is under-researched.