What key concept did the declaration of independance borrow from john Locke?

The Declaration of Independence borrowed the key concept of natural rights from john Locke, particularly the ideas of life, liberty, and the pursuit of happiness. Locke argued that individuals possess inherent rights that governments must protect, and if a government fails to do so, the people have the right to alter or abolish it. This philosophical foundation influenced the Declaration's assertion that governments derive their power from the consent of the governed and must respect the rights of individuals.