Enrico Spolaore (Tufts): The Economics of Political Borders. From Collegium, a special issue on Trade and War: The Neutrality of Commerce in the Inter-State System. Modern humans have created many thousands of distinct cultures — so what will it mean if globalization turns us into one giant, homogenous world culture? A review of Fragile States: War and Conflict in the Modern World by Lothar Brock, Hans-Henrik Holm, Georg Sorensen and Michael Stohl. Worldwatch explores nine polices to help stabilize population growth. Globalisation can work, but only with a unified international plan, with economic and social institutions working across national borders. Invisible hand, greased palm: James Surowiecki on the battle against global corruption. When faced with a popular uprising, a regime typically survives when the military defends it, and falls when the military chooses not to defend — why would a military defect from its regime? Seyla Benhabib on the morality of migration: Immigration pits two moral and legal principles, foundational to the modern state system, against each other — how can they be reconciled?