A US citizen is a Federal citizen.

A Federal citizen is a 14th Amendment citizen.

In the hallmark court case of what's come to be known as the Slaughterhouse Trials, the presiding Chief Justice ruled 14th Amendment citizens are NOT guaranteed the Constitution's Bill of Rights. That's only for Citizens among the 50 states. Look it up!

In case you got lost, remember how this started. A US citizen is NOT a Citizen to any of the Union states. A U.S. citizen is "domiciled" in the District of Columbia, regardless of which state they are "residing" in.

Yes; America has two citizenships. Union state vs Federal. And if you don't know which you are, the govt presumes you are a Federal citizen.