The overall trend of social evolution during the last 10,000 years has been from small- to large-scale societies. If the typical scale of human societies was initially in the hundreds, it is now in the hundreds of millions. War has been the chief evolutionary force in this astr

  Ten years ago, in 2005, I wrote in War and Peace and War: On March 25, 1957, in a spectacular Renaissance palazzo in Rome six European nations—France, West Germany, Italy, Belgium, the Netherlands, and Luxembourg—signed the treaty establishing the European Economic Community, t