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Enlightenment thinkers developed the theory that individuals possessed certain natural rights—to life, liberty, property—that preceded government and could not be legitimately violated by political authority. Natural rights theory inverted the medieval and feudal understanding of rights as privileges granted by superiors, instead proposing rights as fundamental to human nature and universal to all humans. This theory justified both limited government (the state exists to protect rights) and revolution (when government violates rights, subjects may resist). Natural rights philosophy provided the intellectual foundation for revolutionary movements of the late eighteenth century and modern human rights discourse.
You know from the Enlightenment's origins that its central move was to apply reason to social and political questions with the same rigor being applied to nature. Natural rights theory is where that project becomes most politically explosive. The core inversion is simple but radical: in feudal and traditional thinking, rights were *grants* — a king gave privileges to a lord, a lord extended protections to peasants. Rights flowed downward from authority. Natural rights theory reversed the direction: rights exist prior to government and are not granted by it. They inhere in persons simply because they are human.
John Locke, the most influential architect of this view, grounded natural rights in the state of nature — a thought experiment you may recognize from Hobbes, who argued it was a war of all against all. Locke's state of nature is quite different: people already possess reason and, through it, awareness of natural law. They already have rights to life, liberty, and property (derived from their labor). Government is created by social contract not to escape a barbaric condition, but to better protect rights that already exist. This repositions political authority entirely: governments are not sovereign by divine right or conquest but by consent of the governed, and their authority extends only as far as the protection of rights.
The logical implication is that resistance is justified when government systematically violates rights. This was not merely theoretical — Locke wrote his *Two Treatises* in the context of the Glorious Revolution (1688) and meant to justify Parliament's deposition of James II. The American Declaration of Independence (1776) and French Declaration of the Rights of Man (1789) both echo Locke almost verbatim: "life, liberty, and the pursuit of happiness" is a paraphrase of "life, liberty, and property." For both revolutions, natural rights theory provided the moral vocabulary to declare existing authority illegitimate.
There is a tension worth carrying forward. Natural rights theory claimed universality — all humans possess these rights by nature — but its first beneficiaries were propertied men in European-descended societies. Women were excluded from full political rights; enslaved people were denied them through elaborate rationalizations. This gap between the universalist logic of natural rights and the exclusionary practice of the states it inspired became the central contested question of the next two centuries. Every subsequent movement — abolitionism, women's suffrage, anti-colonialism, civil rights — drew on the same natural rights vocabulary to expose the contradiction between the theory's claims and its limited application.
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