Louis Stephen St. Laurent (
Saint-Laurent or
St-Laurent in French, baptized
Louis-Étienne St-Laurent), (1 February 188225 July 1973) was the
12th Prime Minister of Canada, from 15 November 1948 to 21 June 1957. He was a
Liberal with a strong base in the Catholic francophone community, from which base he had long mobilised support to Prime Minister
William Lyon Mackenzie King. His foreign policy initiatives transformed Canada from an isolationism with little role in world affairs to an active "middle power." St. Laurent was an enthusiastic proponent of Canada's joining
NATO in 1949 to fight Communist totalitarianism, overcoming opposition from some intellectuals, the far left, and many French Canadians. The contrast with Mackenzie King was not dramatic – they agreed on most policies. St. Laurent had more hatred of communism, and less fear of the United States. He was neither an idealist nor a bookish intellectual, but an "eminently moderate, cautious conservative man....and a strong Canadian nationalist."