"For much of its history, human population growth increased at a glacial pace. The demographic rate only soared about 200 years ago, climaxing in the period 1950-2000. In that 50-year span, the population grew more than it had in the previous 5000 years. Though these raw numbers are impressive,...

We study the effect of railroad access on urban population growth. Using GIS techniques, we match triennial population data for roughly 1,000 cities in nineteenth-century Prussia to georeferenced maps of the German railroad network. We find positive short- and long-term effects of having a...