Final answer:
The Declaration of Independence's rationale primarily stems from John Locke's theories.
Explanation:
True. The rationale that Jefferson used in the Declaration of Independence primarily came from the theories of John Locke. Locke's ideas of natural rights and social contract heavily influenced Jefferson's writing in the Declaration.
John Locke's philosophical principles, emphasizing individual rights and government's obligation to protect those rights, laid the groundwork for concepts such as 'life, liberty, and the pursuit of happiness' in the Declaration.
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