Friends and Enemies presents a collection of essays on Canadian foreign policy written by J.L. Granatstein, one of the leading political and military historians in the country. The essays cover a period primarily from the Second World War through to the early 2000s and examine policy under prime ministers Mackenzie King, Louis St. Laurent, John Diefenbaker, Lester Pearson, and Pierre Trudeau. Based on interviews and extensive archival research, the essays reveal how Granatstein's views shifted as he reacted to altered conditions in Canada, Canadian alliances, and the world situation.