"William Lyon Mackenzie King had a long political career. He was leader of the Liberal Party for 29 eventful years through the buoyant expansion of the 1920s, the depression of the 1930s, the shock of World War II, and then the post-war reconstruction, and for 21 of these years he was Canada’s prime minister. His decisions during this time contributed significantly to the shaping of Canada and to its development as an influential middle power in world affairs. During his lifetime his achievements were sometimes obscured by a style notable for its compromises. After his death his political career was sometimes overshadowed by the revelation of his unsuspected personal idiosyncrasies."