Data sets

While the factors affecting the initiation of war have been extensively studied, the factors that determine the outcome of war have been neglected. Using quantitative data and historical illustrations from the early 1800s to the late 1980s, Allan Stam investigates the relative effect on war outcomes of both the choices leaders must make during war and the resources they have at their disposal. Strategy choices, along with decisions about troop levels and defense spending, are not made in a vacuum, according to Stam, but are made in the crucible of domestic politics. Because of domestic political constraints, states must frequently choose less than optimal strategies in the international arena. Stam shows how we must go beyond simply counting resources and look at the process or strategy by which they are employed as the key factor determining who will win.

Challenging the assumptions of many realist and neorealist thinkers on war and interstate conflict, Stam shows how domestic political factors affect the outcome of war. Using a rational choice analysis, Stam looks at the factors that affect the decisionmakers' preferences for different outcomes of military conflict, as well as how the payoffs of those outcomes are affected by both domestic and structural factors. Structural factors, such as the state's population, define a state's power relative to that of other states and will affect the probability of a policy succeeding. Domestic factors, such as the positions taken by domestic political groups, will affect the preferences of the leaders for particular outcomes and their willingness to bear the costs associated with the payoffs and probabilities of the various outcomes.