where or when exactly, after the climate had warmed up, it would happen. Rather, this was determined by the interaction of a critical juncture, the Long Summer, with small but important institutional differences that mattered. As the climate warmed up, some societies, such as the Natufians, developed elements of centralized institutions and hierarchy, though these were on a very small scale relative to those of modern nation-states. Like the Bushong under Shyaam, societies reorganized to take advantage of the greater opportunities created by the glut of wild plants and animals, and it was no doubt the political elites who were the main beneficiaries of these new opportunities and of the political centralization process. Other places that had only slightly different institutions did not permit their political elites to take similar advantage of this juncture and lagged behind the process of political centralization and the creation of settled, agricultural, and more complex societies. This paved the way to a subsequent divergence of exactly the type we have seen before. Once these differences emerged, they spread to some places but not to others. For example, farming spread into Europe from the Middle East starting around 6500 BC, mostly as a consequence of the migration of farmers. In Europe, institutions drifted away from parts of the world, such as Africa, where initial institutions had been different and where the innovations set in motion by the Long Summer in the Middle East happened only much later, and even then in a different form.
THE INSTITUTIONAL INNOVATIONS of the Natufians, though they did most likely underpin the Neolithic Revolution, did not leave a simple legacy in world history and did not lead inexorably to the long-run prosperity of their homelands in modern Israel, Palestine, and Syria. Syria and Palestine are relatively poor parts of the modern world, and the prosperity of Israel was largely imported by the settlement of Jewish people after the Second World War and their high levels of education and easy access to advanced technologies. The early growth of the Natufians did not become sustained for the same reason that Soviet growth fizzled out. Though highly significant, even revolutionary for