What are the origins of global conflict, whether historical or contemporary, among nation-states or other actors? How have peace and justice movements evolved in response?
There are specialized encyclopedias in the reference section covering major world conflicts, including World War I and World War II as well as the Civil War, the Vietnam War, and the Korean War. These tend to emphasize military history but include some social history as well.
You will find encyclopedias covering countries and regions of the world including Africa, the Middle East, and East Asia as well as this work covering issues and countries.