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"(...) It is not difficult to predict the consequences of an open border policy in the present world. If Switzerland, Austria, Germany or Italy, for instance, freely admitted everyone who made it to their borders and demanded entry, these countries would quickly be overrun by millions of third-world immigrants from Albania, Bangladesh, India, Nigeria, for example. As the more perceptive open-border advocates realize, the domestic state-welfare programs and provisions would collapse as a consequence. This would not be a reason for concern; for surely, in order to regain effective protection of person and property, the welfare state must be abolished. But then comes the great leap – or the gaping hole – in the open border argument. Somehow, out of the ruins of the democratic welfare states, we are supposed to believe, a new natural order will emerge.
The first error involved in this line of reasoning can be readily identified. Once the welfare states have collapsed under their own weight, the masses of immigrants who have brought this about are still there. They have not been miraculously transformed into Swiss, Austrians, Bavarians or Lombards, but remain what they are: Zulus, Hindus, Ibos, Albanians, or Bangladeshis. Assimilation can work when the number of immigrants is small. It is entirely impossible, however, if immigration occurs on a mass scale. In that case, immigrants will simply transport their own ethno-culture onto the new territory. Accordingly, when the welfare state has imploded there will be a multitude of "little" (or not so little) Calcuttas, Daccas, Lagos’, and Tiranas strewn all over Switzerland, Austria and Italy. It betrays a breathtaking sociological naivitee to believe that out of this admixture a natural order will emerge. Based on all historical experience with such forms of multiculturalism, and given the existence of a state that intrudes into every aspect of social and economic life, it can safely be predicted instead that the result will be civil war. There will be wide-spread plundering and squattering leading to massive capital consumption, and civilization as we know it would disappear from Switzerland, Austria and Italy. Furthermore, the host population will quickly be outbred and ultimately physically displaced by their "guests." There will be still Alps in Austria and Switzerland, but no Austrians or Swiss.
However, the error of the open border proposal goes further than its dire consequences. The fundamental error of the proposal is moral or ethical in nature and lies in its assumption. It is the underlying assumption that foreigners are "entitled," or have a "right," to immigrate. In fact, they have no such right whatsoever.
Foreigners would have a right to enter Switzerland, Austria or Italy only if these places were uninhabited (unowned) territories. However, they are owned, and no one has a right to enter territories owned by others (unless invited by the owner). Nor is it permissible to argue, as some open border proponents have done, that while foreigners may not enter private property without the owner’s permission they may do so with public property. In their eyes, public property is akin to unowned property and thus "open" to everyone, domestic citizen and foreigners alike. But this analogy between public property and unowned resources is mistaken. There exists a categorical difference between unowned resources (open frontier) and public property. Public property is the result of state-government confiscations – of legislative expropriations and/or taxation – of originally privately owned property. While the state does not recognize anyone as its private owner, all of government controlled public property has in fact been brought about by the tax-paying members of the domestic public. Austrians, Swiss, and Italians, in accordance with the amount of taxes paid by each citizen, have funded the Austrian, Swiss, and Italian public property. Hence, they must be considered its legitimate owners. Foreigners have not been subject to domestic taxation and expropriation; hence, they cannot be assumed to have any rights regarding Austrian, Swiss or Italian public property."
Secession, the State, and the Immigration Problem by Hans-Hermann Hoppe