John Locke's theories had a significant influence on the Declaration of Independence, particularly in the following ways:
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Natural Rights: Locke's concept of natural rights—life, liberty, and property—influenced Thomas Jefferson’s articulation of the inalienable rights to "Life, Liberty and the pursuit of Happiness." The Declaration emphasizes that these rights are fundamental and cannot be justly taken away by governments.
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Government by Consent: Locke advocated that governments derive their authority from the consent of the governed and that people have the right to overthrow a government that fails to protect their rights. This idea is reflected in the Declaration's assertion that governments are instituted to secure these rights and that it is the right of the people to alter or abolish a government that becomes destructive to those ends.
These two principles rooted in Locke's philosophy provided a foundational justification for the American colonies' decision to declare independence from British rule.