"Concerned about Communism on the global level, and about the stability of Europe and the future of Germany, the Americans, both government and public, did not intend to repeat their interwar isolationism when they had not responded to the expansion of Nazi Germany and, without getting the blame, had, in practice, been prominent among the appeasers. Containment as a concept that was to be applied in American political and military strategy received its intellectual rationale in 1947 from George Kennan, the acting head of the American diplomatic mission in Moscow. The emphasis on inherent Soviet antagonism under Stalin in Kennan’s ‘long telegram’ of 22 February 1946 had an impact in Washington and elsewhere. Kennan’s thesis was understood as advocating containment, a view also taken by the Canadian Escott Reid. Kennan followed up with a ‘Mr X’ article, drawing on the ‘long telegram’, in Foreign Affairs in April 1947, an article that made much use of the word containment. In 1947, Kennan, who argued that the division of Europe was reversible, became Director of Policy Planning in the State Department. The concept of containment was developed with the Truman government advancing the idea of America’s perimeter of vital interests. The perimeter was to be consolidated by the establishment of regional security pacts, notably the North Atlantic Treaty Organisation (NATO), created in 1949."