by Murray N. Rothbard
Mises.org
What national boundaries can be considered as just? In the first place, it must be recognized that there are no just national boundaries per se; that real justice can only be founded on the property rights of individuals. If fifty people decided voluntarily to set up an organization for common services or self-defense of their persons and properties in a certain geographical area, then the boundaries of that association, based on the just property rights of the members, will also be just.
National boundaries are only just insofar as they are based on voluntary consent and the property rights of their members or citizens. Just national boundaries are, then, at best derivative and not primary: How much more is this true of existing State boundaries which are, in greater or lesser degree, based on coercive expropriation of private property; or on a mixture of that with voluntary consent!