Francis Fukuyama, the author of “The End of History,” one of the most discussed political essays in recent decades, here travels back to prehistory to look for the key to understanding political order. Fukuyama is frustrated by the difficulty of building stable, order-keeping states in the contemporary developing world. What is the historical secret leading to stable political orders, such as Denmark's, he asks, and can that secret be shared with the Somalias and Afghanistans of the world?