Henry R. Nau’s best-selling book, , is admired for its even-handed presentation of realism, liberalism, constructivism, and critical theory and for integrating these perspectives in every chapter. Students are able to explore the ways these different perspectives shape our understanding of the root causes of historical events and current controversies, and then think critically about the world’s most urgent issues. The new includes updates on Brexit, the rise of nationalism, the escalation of terrorism, the use of social media in political protests around the world, and continuing developments in North Korea, Syria, Iran, China, and Russia.