This clear and concise text introduces four key theoretical frameworks that form the foundation of international relations-realism, liberalism, constructivism, and feminist theory-and uses levels of analysis as the primary unifying force to explain contemporary global politics. Cases on climate change; gender, peace, and security; migration; and the rise of China illustrate Kaufman's approach.The third edition explains core issues in international relations, such as the interaction of nations in a globalized world; the growing threat posed by non-state actors and civil conflicts; and the need for countries to work together to counter what have been called "e;existential crises,"e; such as climate change, which threaten human lives and the planet. Significant revisions focus on discussion of democratic backsliding, the Covid-19 pandemic, cyberterrorism and cyberwar, changes to the European Union, and expanded coverage of international political economy.