Two core ideas from the Enlightenment that the Founding Fathers used when creating the system of government are:
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Social Contract - This idea, popularized by philosophers like John Locke, suggests that government is based on the consent of the governed, and that individuals agree to form a government to protect their rights in exchange for some of their freedoms.
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Natural Rights - Also championed by John Locke, this concept asserts that all individuals have inherent rights to life, liberty, and property that cannot be taken away by the government. These ideas heavily influenced the Declaration of Independence and the Constitution.