Front Page Titles (by Subject) CHAPTER XVII: How a Nation may separate itself from the State of which it is a Member, or renounce its Allegiance to its Sovereign when it is not protected. - The Law of Nations, Or, Principles of the Law of Nature, Applied to the Conduct and Affairs of Nations and Sovereigns, with Three Early Essays on the Origin and Nature of Natural Law and on Luxury (LF ed.)
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CHAPTER XVII: How a Nation may separate itself from the State of which it is a Member, or renounce its Allegiance to its Sovereign when it is not protected. - Emer de Vattel, The Law of Nations, Or, Principles of the Law of Nature, Applied to the Conduct and Affairs of Nations and Sovereigns, with Three Early Essays on the Origin and Nature of Natural Law and on Luxury (LF ed.) 
The Law of Nations, Or, Principles of the Law of Nature, Applied to the Conduct and Affairs of Nations and Sovereigns, with Three Early Essays on the Origin and Nature of Natural Law and on Luxury, edited and with an Introduction by Béla Kapossy and Richard Whitmore (Indianapolis: Liberty Fund, 2008).
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How a Nation may separate itself from the State of which it is a Member, or renounce its Allegiance to its Sovereign when it is not protected.
§200. Difference between the present case and those in the preceding chapter.We have said that an independent nation, which, without becoming a member of another state, has voluntarily rendered itself dependent on or subject to it in order to obtain protection, is released from its engagements as soon as that protection fails, even though the failure happen through the inability of the protector. But we are not to conclude that it is precisely the same case with every nation that cannot obtain speedy and effectual protection from its natural sovereign or the state of which it is a member. The two cases are very different. In the former, a free nation becomes subject to another state,—not to partake of all the other’s advantages, and form with it an absolute union of interests (for if the more powerful state were willing to confer so great a favour, the weaker one would be incorporated, not subjected),—but to obtain protection alone by the sacrifice of its liberty, without expecting any other return. When therefore the sole and indispensable condition of its subjection is (from what cause soever) not complied with, it is free from its engagements; and its duty towards itself obliges it to take fresh methods to provide for its own security. But the several members of one individual state, as they all equally participate in the advantages it procures, are bound uniformly to sup-port it: they have entered into mutual engagements to continue united with each other, and to have on all occasions but one common cause. If those who are menaced or attacked might separate themselves from the others in order to avoid a present danger, every state would soon be dismembered and destroyed. It is then essentially necessary for the safety of society, and even for the welfare of all its members, that each part should with all its might resist a common enemy, rather than separate from the others; and this is consequently one of the necessary conditions of the political association. The natural subjects of a prince are bound to him without any other reserve than the observation of the fundamental laws;—it is their duty to remain faithful to him, as it is his, on the other hand, to take care to govern them well: both parties have but one common interest; the people and the prince together constitute but one complete whole, one and the same society. It is then an essential and necessary condition of the political society, that the subjects remain united to their prince, as far as in their power.
§201. Duty of the members of a state, or subjects of a prince, who are in danger.When, therefore, a city or a province is threatened or actually attacked, it must not, for the sake of escaping the danger, separate itself from the state of which it is a member, or abandon its natural prince, even when the state or the prince is unable to give it immediate and effectual assistance. Its duty, its political engagements, oblige it to make the greatest efforts, in order to maintain itself in its present state. If it is overcome by force,—necessity, that irresistible law, frees it from its former engagements, and gives it a right to treat with the conqueror, in order to obtain the best terms possible. If it must either submit to him or perish, who can doubt but that it may and even ought to prefer the former alternative? Modern usage is conformable to this decision:—a city submits to the enemy when it cannot expect safety from a vigorous resistance; it takes an oath of fidelity to him; and its sovereign lays the blame on fortune alone.
§202. Their right when they are abandoned.The state is obliged to defend and preserve all its members (§17); and the prince owes the same assistance to his subjects. If, therefore, the state or the prince refuses or neglects to succour a body of people who are exposed to imminent danger, the latter, being thus abandoned, become perfectly free to provide for their own safety and preservation in whatever manner they find most convenient, without paying the least regard to those who, by abandoning them, have been the first to fail in their duty. The country of Zug, being attacked by the Swiss in 1352, sent for succour to the duke of Austria its sovereign; but that prince, being engaged in discourse concerning his hawks at the time when the deputies appeared before him, would scarcely condescend to hear them. Thus abandoned, the people of Zug entered into the Helvetic confederacy.* The city of Zurich had been in the same situation the year before. Being attacked by a band of rebellious citizens who were supported by the neighbouring nobility and the house of Austria, it made application to the head of the empire: but Charles IV.73 who was then emperor, declared to its deputies that he could not defend it;—upon which, Zurich secured its safety by an alliance with the Swiss.† The same reason has authorised the Swiss in general to separate themselves entirely from the empire, which never protected them in any emergency: they had not owned its authority for a long time before their independence was acknowledged by the emperor and the whole Germanic body, at the treaty of Westphalia.
[* ] See Etterlin, Simler, and de Watteville.
[73. ] Bullinger discusses the events Vattel refers to at Zurich, including the role of Charles IV (r. 1355–78), in his famous Chronicle of Zurich (“Tigurinerchronik,” pt. 1, bk. 8, chap. 5). Never published, the Chronicle was available only in several manuscript copies (see Zentralbibliothek Zürich, Ms. Car 43 and 44; for the relevant passage see Car 43, p. 371r–374v). Vattel may well have had access to the Chronicle, although there is no evidence to support such a claim.
[† ] See the same historians, and Bullinger, Stumpf, Tschudi, and Stettler.