Final answer:
Eighteenth-century liberalism was deeply influenced by John Locke's philosophy, especially in the principles included in the Declaration of Independence drafted by Thomas Jefferson, who was inspired by Locke's ideas of the consent of the governed, natural rights, and the sovereignty of the people.
Step-by-step explanation:
Eighteenth-century liberalism was indeed significantly influenced by the philosophy of John Locke. The ideas posited by Locke about the consent of the governed and natural rights, such as life, liberty, and property, are fundamental to both Locke's philosophy and the liberalism of the eighteenth century. This is demonstrably true regarding the Declaration of Independence, where Thomas Jefferson adopted Locke's theories as the document's rationale.
Locke's concepts of limited government, religious toleration, and the right of the people to oppose political authority not representing their consent were vital in shaping the revolutionary movements not only in North America but also in places like Haiti and France. All of which led to written constitutions asserting the sovereignty of the people and emphasizing the Enlightenment ideals of natural rights.