Using newly collected national and sub-national data and historical case studies, this paper argues that differences in innovative capacity, captured by the density of engineers at the dawn of the Second Industrial Revolution, are important to explaining present in come differences, and, in...

Using subnational historical data, this paper establishes the within country persistence of economic activity in the New World over the last half millennium. We construct a data set incorporating measures of pre-colonial population density, new measures of present regional per capita income and...