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...

State capacity matters for growth. I test Bates’ explanation of pre-colonial African states. He argues that trade across ecological boundaries promoted states. I find that African societies in ecologically diverse environments had more centralized states. This is robust to reverse causation,...

The conventional view is that an increase in the value of a natural resource can lead to private property over it. Many Igbo groups in Nigeria, however, curtailed private rights over palm trees in response to the palm produce trade of the nineteenth and early twentieth centuries. I present a...

Motivated by a simple model, I use DHS data to test nine hypotheses about the prevalence and decline of African polygamy. First, greater female involvement in agriculture does not increase polygamy. Second, past inequality better predicts polygamy today than does current inequality. Third, the...

Suppression of the slave trade after 1807 increased the incidence of conflict between Africans. We use geo-coded data on African conflicts to uncover a discontinuous increase in conflict after 1807 in areas affected by the slave trade. In West Africa, the slave trade declined. This empowered...

African societies exported more slaves in colder years. Lower temperatures reduced mortality and raised agricultural yields, lowering slave supply costs. Our results help explain African participation in the slave trade, which predicts adverse outcomes today. We use an annual panel of African...

We test whether early-life war exposure influences later-life political engagement in Africa. We combine data on the location and intensity of conflicts since 1945 with nationally representative data on political attitudes and behaviors from 17 sub-Saharan African countries. Exposure from ages 0...

We study the origins of adult mental health using early life income fluctuations. Combining a time series of real producer prices of cocoa with a nationally representative household survey in Ghana, we show that a one standard deviation rise in the cocoa price in early life decreases the...

We show that rainfall, temperature, and commodity price shocks predict unrest in colonial French West Africa between 1906 and 1956. We use a simple model of taxation and anti-tax resistance to explain these results. In the colonial period, the response of unrest to economic shocks was strongest...

Oil prices experienced in early life predict differential adult outcomes across Nigerian ethnic groups. Our difference-in-difference approach compares members of southern ethnicities to other Nigerians from the same birth cohort. Greater prices in a southern individual’s birth year predict...