Democracy
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A democracy is a government that gives all citizens an equal voice in determining state policy, typically through a governing constitution.
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Citizens organize political parties, hold elections, and are guaranteed rights a constitution specifies, rather than deferring to one ruler's will.
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Naming a nation a democracy describes an ideal its constitution states; how closely practice matches that ideal is a separate question.