Since World War II, significant conflicts have most often taken the form of acts of violence between ethnic or national communities inside individual states. This two-volume work uses case studies to explore some four dozen of those conflicts, making it an ideal first-stop reference for students and others who wish to quickly gain an understanding of ethnic struggles. Content from the first edition is updated and new entries on recent conflicts have been added.

The set's geographical range, which encompasses nearly every continent, is matched by the diversity of the conflicts explored. These include internal conflicts such as those experienced by African Americans in the United States and Muslims in France, as well as separatist movements of groups like the Chechens in Russia and Bosnians in Yugoslavia. Headline-making conflicts—for example, those in Mali and Syria—are covered as well. The book is organized alphabetically by country and region. Each essay begins with a timeline and then explores the historical background, evolution, efforts to manage, and significance of the conflict. Suggestions for follow-up research and appendices of relevant, primary source materials are also included.