Harvey M. Sapolsky, who directs the Security Studies Program at the Massachusetts Institute of Technology, told some unpleasant home truths to Canadians last month in a full-page article published in the National Post. There has been little response to it, either officially or editorially, and that is significant. "Canada is a security risk to the United States," wrote Sapolsky. "Anti-Americanism is the unstated essence of the modern Canadian identity." But there are reasons for this. After the Second World War, when Canada's historic British connection began to decline, "the threat of being absorbed, not by a conquering but by a...