It is often said that those who do not learn from history are doomed to repeat it. Sound advice though this may be, it does not get one very far in practice. The reason is that there is no agent called “history” which teaches unambiguous moral lessons. Study World War II and you may come away believing that nation-building works. Study Iraq and you may come away believing the opposite. In the end, the historical episodes we choose to study — and to ignore — say less about the wisdom offered by “history” and more about the lessons that we consider relevant today.