 Another solution to the boundary problem is a conservative one. The basic idea is to keep the boundaries of states roughly as they are except if there is a pressing need to change them. Trying to alter the boundaries of political societies is a recipe for serious conflict because there is no institution that has the legitimacy or power actually to resolve problems at an international level and there is likely to be a lot of disagreement on how to do it. States as we know them, are by far the most powerful political entities in the international system. They have developed more effective practices of accountability of power than any other entity in the system. They have created unified societies with highly interdependent populations. Finally, states and the individuals in them can be made accountable to some degree to other individuals and states through the process of negotiation and international law making. The origin of these boundaries may be arbitrary, but it is not, for all that, irrelevant. To be sure, there are clear cases where borders can be changed. One source of pressing need is serious injustice within a country. Another might be the existence of permanent minorities that are sectionally defined. Here, we ask only how to revise boundaries and the basis of such revision is that it is a remedy for serious injustice (Buchanan 1991).