The World of Protracted Conflicts seeks to frame the models to answer three crucial questions about interstate protracted conflict: what are the most likely conditions for the onset of a protracted conflict, its escalation/persistence, and its termination? It presents the findings on protracted conflict occurrence, continuation, and resolution through testing these models and their derived hypotheses against the evidence from 33 interstate protracted conflicts in the last century. These findings will, in turn, shed further light on the conflict-crisis-war linkage. This book examines and explains patterns that exist in the eruption, evolution, and winding down of these conflicts through a systematic comparison of recent and contemporary PCs.