'[Sluga] engages the swirl of activists, organizations, and government bodies that drew on psychological concepts in their struggle to reconcile national self-determination with the tenets of liberalism. Her account is especially noteworthy for demonstrating the biological and hereditarian cast of arguments in liberal understandings of self-determination.' - Eric J. Engstrom, American Historical Review 'Glenda Sluga's book marks an important contribution to the transnational history of the idea of the nation...a thoroughly engaging book.' - Daniel Laqua, Reviews in History