From Sex and war Via Andrew Sullivan
Can all conflict be reduced beyond even team aggression and resource competition, down to the single factor of population growth? It’s not quite that simple, but a deeper investigation of the role of population increase shows quite clearly that growth rate and population demographics function as significant triggers for raiding, wars, and even terrorism.
If we hope to reduce the number and severity of these violent incidents in our world, this is a relationship we need to understand. Peter Turchin of the University of Connecticut and his Russian colleague Andrey Korotayev provide important quantitative insight into the dynamic connections between population growth and conflict. In a careful study of English, Chinese, and Roman history, they showed a statistical correlation between an increase in population density and warfare, although not surprisingly the impact of population growth was not immediate but took some time to develop. It is not the infant playing at the hearth but the hungry landless peasant twenty years later who causes the conflict. Adjusting for this and other variables (such as the fact that wars themselves tend to reduce population), and using robust data on population growth from church records in England along with historical data on conflict, Turchin and Korotayev found that intervals of relative peace and rapid population growth were followed by periods of conflict and slower population growth. Their study suggests that population growth accounts for a powerful 80–90 percent* of the variation between periods of war and peace. Even if the influence of population is substantially less than that, it remains outstandingly important. But here is the crucial point: Rapid population growth is not just an important cause of violent conflicts. In the contemporary world, population growth is a cause that can be contained by purely voluntary means.
Rather than exporting democracy we should be exporting birth control.