Theoretical foundations for the collection of major power‐minor power war data

Two basic theoretical considerations underlie the collection of data on major power‐minor power conflicts. Both perspectives have major power‐minor power relations at their core, and are developed more fully in The Onset of World War (Midlarsky, 1988). First, an hierarchical equilibrium structure consists of two components: (1) two or more alliances (or other loose hierarchies such as loosely‐knit empires) of varying size and composition but clearly including a great power and a number of small powers within each, and (2) a relatively large number of small powers not formally associated with any of the great powers. Time periods during which the hierarchical equilibrium was obeyed did not experience systemic war, while those in which it was violated experienced this type of warfare. The second major theoretical basis is the overlap between great power conflicts exclusively, on the one hand, and great power‐small power conflicts on the other. This combination was a major contributor to the onset of World War I as well as other systemic wars such at the Thirty Years’ War and the Peloponnesian War.