In one of his very worst philosophical leaps, Locke treats chattel slavery in the Atlantic world as a mere extension of war.

Nicknamed the "Father of Liberalism," Locke's theories have formed the foundation of many important works, including the U.S. Declaration of Independence and Constitution. His theories of social contract, the mind, and property are perhaps the most widely known.

Editor’s Note
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Anthony Comegna, PhD

Assistant Editor for Intellectual History

No political philosophy ultimately developed based on the experience of the frontier in the Americas would be complete without an account of war and slavery almost at the very beginning. War and slavery were practically the first things Europeans brought with them to American soil, and as such they were quite worthy of some explanation. In Locke’s state of nature—where every individual has an equal right to protect themselves and enforce the law of self-preservation—any individual may choose to place themselves in a state of war relative to any of their peers. Having (officially or informally) declared war on another person, the belligerent forfeits his natural rights to the rival should the rival best him. Once at war with each other, human beings become little different than wolves or lions, stitched together in only the loosest of confederations, the very lightest of common forms of governance, and every bit as dangerous to peaceful people.

Locke reasons that war is a sort of grand effort to bring others into subjection to oneself, either through death and extinction or slavery and service. In the state of nature—with no civil government yet existing—anyone found trying to infringe individual freedoms “must necessarily be supposed to have a design to take away every thing else, that freedom being the foundation of all the rest.” In the state of nature, all people enjoy their equal freedoms but they are equally weighed down by equal responsibilities. A state of war exists, then, when some in the state of nature decide that nature has not been working well enough for them and that the scales could use a bit of tipping. The first person who first decided to use force to get what they want from others—that jerk was the first to corrupt the state of Nature and establish the need for a common civil government.

More than that, though, Locke posits that slavery is itself an extension of the state of war. Once nature was first polluted with warfare and some men declared themselves intractable enemies of their fellow beings, all the rules of polite, natural society change. You can no longer trust this person to respect your life, your liberty, or your property whatsoever and would be quite justified in snuffing them out altogether as the simplest, surest method of preserving your own existence. It would also, then, be entirely appropriate to dispose of this inherently dangerous person in any number of ways—including holding them to service for the rest of their lives.

Well, that’s Locke’s account of things, at least. He would, of course, have been better served to more closely investigate the states of nature left all over his world, including a few extra special places where settlers brought civil government with them, suffered tremendously from it, and decided they would be better off without it. His abstract argument for the institution of slavery might even hold up if it had anything at all to do with the reality of how people became enslaved in Africa and the Americas. For the remainder of our series, we will interrogate Locke’s assumptions about how people behave in his state of nature, what they gain or lose by entering into civil government, and we will see how Locke helped usher us from a world of primitive liberty to a world bursting with slavery and empire.

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By John Locke
Thomas Hollis Edition. (London: A. Millar et. al.) 1764.

Two Treatises of Civil Government

Book II: Of Civil-​Government

Chapter 3: Of the State of War

THE state of war is a state of enmity and destruction: and therefore declaring by word or action, not a passionate and hasty, but a sedate settled design upon another man’s life, puts him in a state of war with him against whom he has declared such an intention, and so has exposed his life to the other’s power to be taken away by him, or any one that joins with him in his defence, and espouses his quarrel; it being reasonable and just, I should have a right to destroy that which threatens me with destruction: for, by the fundamental law of nature, man being to be preserved as much as possible, when all cannot be preserved, the safety of the innocent is to be preferred: and one may destroy a man who makes war upon him, or has discovered an enmity to his being, for the same reason that he may kill a wolf or a lion; because such men are not under the ties of the common-​law of reason, have no other rule, but that of force and violence, and so may be treated as beasts of prey, those dangerous and noxious creatures, that will be sure to destroy him whenever he falls into their power.

And hence it is, that he who attempts to get another man into his absolute power, does thereby put himself into a state of war with him; it being to be understood as a declaration of a design upon his life: for I have reason to conclude, that he who would get me into his power without my consent, would use me as he pleased when he had got me there, and destroy me too when he had a fancy to it; for no body can desire to have me in his absolute power, unless it be to compel me by force to that which is against the right of my freedom, i.e. make me a slave. To be free from such force is the only security of my preservation; and reason bids me look on him, as an enemy to my preservation, who would take away that freedom which is the fence to it; so that he who makes an attempt to enslave me, thereby puts himself into a state of war with me. He that, in the state of nature, would take away the freedom that belongs to any one in that state, must necessarily be supposed to have a design to take away every thing else, that freedom being the foundation of all the rest; as he that, in the state of society, would take away the freedom belonging to those of that society or common-​wealth, must be supposed to design to take away from them every thing else, and so be looked on as in a state of war.

This makes it lawful for a man to kill a thief, who has not in the least hurt him, nor declared any design upon his life, any farther than, by the use of force, so to get him in his power, as to take away his money, or what he pleases, from him; because using force, where he has no right, to get me into his power, let his pretence be what it will, I have no reason to suppose, that he, who would take away my liberty, would not, when he had me in his power, take away every thing else. And therefore it is lawful for me to treat him as one who has put himself into a state of war with me, i.e. kill him if I can; for to that hazard does he justly expose himself, whoever introduces a state of war, and is aggressor in it.

And here we have the plain difference between the state of nature and the state of war, which however some men have confounded, are as far distant, as a state of peace, good will, mutual assistance and preservation, and a state of enmity, malice, violence and mutual destruction, are one from another. Men living together according to reason, without a common superior on earth, with authority to judge between them, is properly the state of nature. But force, or a declared design of force, upon the person of another, where there is no common superior on earth to appeal to for relief, is the state of war: and it is the want of such an appeal gives a man the right of war even against an aggressor, tho’ he be in society and a fellow subject. Thus a thief, whom I cannot harm, but by appeal to the law, for having stolen all that I am worth, I may kill, when he sets on me to rob me but of my horse or coat; because the law, which was made for my preservation, where it cannot interpose to secure my life from present force, which, if lost, is capable of no reparation, permits me my own defence, and the right of war, a liberty to kill the aggressor, because the aggressor allows not time to appeal to our common judge, nor the decision of the law, for remedy in a case where the mischief may be irreparable. Want of a common judge with authority, puts all men in a state of nature: force without right, upon a man’s person, makes a state of war, both where there is, and is not, a common judge.

But when the actual force is over, the state of war ceases between those that are in society, and are equally on both sides subjected to the fair determination of the law; because then there lies open the remedy of appeal for the past injury, and to prevent future harm: but where no such appeal is, as in the state of nature, for want of positive laws, and judges with authority to appeal to, the state of war once begun, continues, with a right to the innocent party to destroy the other whenever he can, until the aggressor offers peace, and desires reconciliation on such terms as may repair any wrongs he has already done, and secure the innocent for the future; nay, where an appeal to the law, and constituted judges, lies open, but the remedy is denied by a manifest perverting of justice, and a barefaced wresting of the laws to protect or indemnify the violence or injuries of some men, or party of men, there it is hard to imagine any thing but a state of war: for where-​ever violence is used, and injury done, though by hands appointed to administer justice, it is still violence and injury, however coloured with the name, pretences, or forms of law, the end whereof being to protect and redress the innocent, by an unbiassed application of it, to all who are under it; where-​ever that is not bona fide done, war is made upon the sufferers, who having no appeal on earth to right them, they are left to the only remedy in such cases, an appeal to heaven.

To avoid this state of war (wherein there is no appeal but to heaven, and wherein even the least difference is apt to end, where there is no authority to decide between the contenders) is one great reason of men’s putting themselves into society, and quitting the state of nature: for where there is an authority, a power on earth, from which relief can be had by appeal, there the continuance of the state of war is excluded, and the controversy is decided by that power. Had there been any such court, any superior jurisdiction on earth, to determine the right between Jephtha and the Ammonites, they had never come to a state of war: but we see he was forced to appeal to heaven. The Lord the Judge (says he) be judge this day between the children of Israel and the children of Ammon, Judg. xi. 27. and then prosecuting, and relying on his appeal, he leads out his army to battle: and therefore in such controversies, where the question is put, who shall be judge? It cannot be meant, who shall decide the controversy; every one knows what Jephtha here tells us, that the Lord the Judge shall judge. Where there is no judge on earth, the appeal lies to God in heaven. That question then cannot mean, who shall judge, whether another hath put himself in a state of war with me, and whether I may, as Jephtha did, appeal to heaven in it? of that I myself can only be judge in my own conscience, as I will answer it, at the great day, to the supreme judge of all men.

Chapter 4: Of SLAVERY

THE natural liberty of man is to be free from any superior power on earth, and not to be under the will or legislative authority of man, but to have only the law of nature for his rule. The liberty of man, in society, is to be under no other legislative power, but that established, by consent, in the common-​wealth; nor under the dominion of any will, or restraint of any law, but what that legislative shall enact, according to the trust put in it. Freedom then is not what Sir Robert Filmer tells us, a liberty for every one to do what he lists, to live as he pleases, and not to be tied by any laws: but freedom of men under government is, to have a standing rule to live by, common to every one of that society, and made by the legislative power erected in it; a liberty to follow my own will in all things, where the rule prescribes not; and not to be subject to the inconstant, uncertain, unknown, arbitrary will of another man: as freedom of nature is, to be under no other restraint but the law of nature.

This freedom from absolute, arbitrary power, is so necessary to, and closely joined with a man’s preservation, that he cannot part with it, but by what forfeits his preservation and life together: for a man, not having the power of his own life, cannot, by compact, or his own consent, enslave himself to any one, nor put himself under the absolute, arbitrary power of another, to take away his life, when he pleases. No body can give more power than he has himself; and he that cannot take away his own life, cannot give another power over it. Indeed, having by his fault forfeited his own life, by some act that deserves death; he, to whom he has forfeited it, may (when he has him in his power) delay to take it, and make use of him to his own service, and he does him no injury by it: for, whenever he finds the hardship of his slavery outweigh the value of his life, it is in his power, by resisting the will of his master, to draw on himself the death he desires.

This is the perfect condition of slavery, which is nothing else, but the state of war continued, between a lawful conqueror and a captive: for, if once compact enter between them, and make an agreement for a limited power on the one side, and obedience on the other, the state of war and slavery ceases, as long as the compact endures: for, as has been said, no man can, by agreement, pass over to another that which he hath not in himself, a power over his own life.

I confess, we find among the Jews, as well as other nations, that men did sell themselves; but, it is plain, this was only to drudgery, not to slavery: for, it is evident, the person sold was not under an absolute, arbitrary, despotical power: for the master could not have power to kill him, at any time, whom, at a certain time, he was obliged to let go free out of his service; and the master of such a servant was so far from having an arbitrary power over his life, that he could not, at pleasure, so much as maim him, but the loss of an eye, or tooth, set him free, Exod. xxi.