As the distinguished Canadian philosopher Charles Taylor notes in his foreword to this book, liberal democratic political systems are becoming more diverse in terms of the cultural identities of their citizens, yet their legitimacy, unlike that of autocratic states or empires, depends on maintaining a certain level of unity and homogeneity. Without it, neither democratic participation, nor a regime of equal rights, nor even satisfactory economic performance appears to be possible. The effort to create a semblance of coherence and common purpose while recognizing and accepting unavoidable diversity, a theme that has dominated Canadian political discourse and practice for a century and a half, has become a preoccupation for much of the world. Yet there are more questions than answers. Consociationalism, a fashionable concept a generation ago, no longer has many supporters among social scientists. Federalism, originally invented in the United States for quite a different purpose, can accommodate conflicting nationalisms only if a precise geographical boundary can be drawn between them—and not always then.