Nations in Conflict a comparative and quantitative analysis of major powers in world politics over four decades prior to World War I (Choucri and North 1975)—includes a set modeling and simulations that yielded of the empirical connections between the master variables and the behavior of states. Choucri and North (1975) developed an econometric simulation model of six major powers over the span of 45 years leading to World War I. In each case they found the causal connection between the master variables and the overt international behavior. The traditionally dominant power during this period, Great Britain, viewed any significant growth in other powers as a source of threat and these perceptions were translated into specific policies intended to retain an advantage over the other powers, most notably a rapidly growing and newly unified Germany.