This paper discusses the two leading views of history and political institutions. For some scholars, institutions are mainly products of historical logic, while for others, accidents, leaders, and decisions have a significant impact. We argue that while there is clear evidence that history matters and has long-term effects, there is not enough data to help us distinguish between the two views. Faced with this uncertainty, what is a social scientist to do? We argue that given the possibility that policy decisions indeed make a difference, it makes sense to assume they do and to try to improve policymaking.