Yes it is true, there are two citizen

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Since the adoption of the Fourteenth Amendment and the Slaughterhouse Cases, there are now two citizens in the nation of the United States: a citizen of the United States, under Section 1 of the Fourteenth Amendment; and a citizen of the several States, under Article 4, Section 2, Clause 1 of the Constitution of the United States of America.

Legal authority quoted, cited and linked.

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