The Constitution
popular sovereignty
The principle that governmental authority comes from the people, who can alter or replace their government. The premise behind 'We the People'.
In full
Popular sovereignty explains why the Constitution was submitted to conventions of the people rather than to state legislatures alone, and why it can be amended. It does not mean majority rule without limit: the same document that rests on popular consent also entrenches rights and structures that ordinary majorities cannot change.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.