Final answer:
According to John Locke, Thomas Jefferson, and the Declaration of Independence, governmental power should be based on the will of the people and social contract theory.
Step-by-step explanation:
The governmental power according to John Locke, Thomas Jefferson, and the ideas expressed in the Declaration of Independence is based on the will of the people and social contract theory. According to Locke, people have natural rights to life, liberty, and property, and they form a social contract with the government to protect these rights. If the government fails to do so, the people have the right to overthrow that government. This idea greatly influenced Jefferson as he drafted the Declaration of Independence.