Includes bibliographical references and index.

This book is a classic introduction to International Relations (IR) theory, written to help students understand that there is no single way to explain world politics. Instead, Patrick M. Morgan argues that international politics must be studied through multiple theoretical lenses, each highlighting different aspects of global behavior.

The core idea is that IR theory is not just abstract philosophy—it is a set of tools for interpreting real-world political events, such as war, alliances, diplomacy, and conflict management.

Morgan emphasizes:

The complexity of international systems
The limits of any “single grand theory”
The value of comparing competing approaches