a government acquires its legitimacy by being voted into office. they stay in power for a certain number of years before another vote, or election, is held. this means that the government is held accountable to the electorate in that country (the government is given the blame when things go wrong by those who vote).
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A government loses legitimacy by irritating the governed to the point that they stop coöperating with the government. This is what happened to the government of the Union of Soviet Socialist Republics, which now no longer exists, and the government of the German "Democratic" Republic. A government usually irritates people by flagrantly defying the constitution and taking bribes … I mean, "campaign contributions" … from the wealthy elite. This is currently going on in the United States and the EU (Empire Unfolding).
SOVEREIGNITY
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