This work includes chapters on the following contemporary topics: - Normative Theory in IR - Critical Theories and Poststructuralism - Efforts at Theoretical Synthesis in IR: Possibilities and Limits - International Law and International Relations - Transnational Diffusion: Norms, Ideas and Policies - Comparative Regionalism - Nationalism and Ethnicity - Geopolitics in the 21st Century - Terrorism and International Relations - Religion and International Politics - International Migration A truly international undertaking, this Handbook reviews the many historical, philosophical, analytical and normative roots to the discipline and covers the key contemporary topics of research and debate today. The Handbook of International Relations remains an essential benchmark publication for all advanced undergraduates, graduate students and academics in politics and international relations.