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It has been interpreted by the early congresses, and that is all that matters.
Vague terms never make legal precedent.
Keep straining your gnats, and swallowing your camels.
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Congress and SCOTUS have made egregious mistakes.
Black’s Law dictionary stands on the wisdom of centuries of English Common Law. It is not vague language. It is clear and precise. A natural born citizen is a person born in the land where he IS a citizen.