Are structural reforms growth enhancing? Is the effectiveness of reforms constrained by a country's distance from the technology frontier or by its institutional environment? This paper takes a new and comprehensive look at these questions by employing a novel data set that includes several...

In a series of influential studies, Huntington (1993a, 1993b, 1998) argued that the fundamental source of conflict in the post-Cold War world will not be primarily ideological or economic, but rather the great divisions among humankind. Given the fault lines between civilizations, the primary...

Using a theory based gravity equation, I first show that cultural dissimilarity (similarity) negatively (positively) affects bilateral imports of countries. More importantly, I examine Huntington's the Clash of Civilizations hypothesis and provide evidence that the impact of cultural...

We show that the long-run consequences of historical warfare are different for Sub-Saharan Africa than for the rest of the Old World.  We identify the locations of over 1,750 conflicts in Africa, Asia, and Europe from 1400 to 1799.  We find that historical warfare predicts greater state...

We show that the long-run consequences of historical warfare are different for Sub-Saharan Africa than for the rest of the Old World. We identify the locations of over 1,750 conflicts in Africa, Asia, and Europe from 1400 to 1799. We find that historical warfare predicts greater state capacity...

We present new evidence about the relationship between military conflict and city population growth in Europe from the fall of Charlemagne’s empire to the start of the Industrial Revolution. Military conflict was a main feature of European history. We argue that cities were safe harbors...

We provide the first systematic examination of the determinants of military mobilization over the very long run. Focusing on a sample of thirteen great powers between 1600 and 2000 we argue that changes in transport and communications technology were the single most important factor in both...

We investigate how technology has influenced the size of armies. During the nineteenth century the development of the railroad made it possible to field and support mass armies, significantly increasing the observed size of military forces. During the late twentieth century further advances in...