The Commercial Organization of the Slave Trade

In Angola, climatic instability contributed to maintaining a precarious balance between food resources, population and disease long before the nineteenth century. Periods of exceptionally irregular rainfall, lasting several years, were preceded or accompanied by plagues of locusts which caused famines at least once every decade. The coastal lowland and the extreme south were especially vulnerable. Prolonged hunger crises led to malnutrition, lowered resistance to disease and epidemic outbreaks, especially of smallpox. A rhythm of drought and smallpox can be discerned in Angola, at least since the seventeeth century. From the 1830s the gradual decline of the overseas slave trade and rise of commerce in raw materials and cash crops brought important demographic changes. These contributed to the worsening famines and epidemic crises of the late nineteenth century. Commercial instability and rural depopulation hindered the growth of Portuguese plantation prosperity. Soon after, however, similar crises aided Portuguese military conquest in Angola by weakening African ability to mobilize effective resistance. In the twentieth century malnutrition continued to be the most widespread problem of Angola's Africans and on occasion it drove them to revolt.