Theorising within the American 'discipline' of International Relations has been plagued by a rather severe intellectual crisis. Theorists have meant that they need to emulate the natural sciences of the eighteenth and nineteenth centuries in outlook and argumentative style. But this has destroyed much awareness for the 'nature' of modern international relations as a dynamically evolving historical process. This book seeks to overcome the vicissitudes of mainstream theorising by abandoning the discipline's scientism and by adopting a stance that is more in tune with the standards of modern social science.