a "U.S. citizen" is a FEDERAL citizenship status brought into existence at the creation of the 14th Amendment, @walker
And it is that status which 99.999% of Mcmericans have traded their State citizenship (and its constitutional rights) for by entering into federal adhesion contract franchises such as SS, medicare, etc...
In other words... yer barking up the wrong tree.
Incredulous? then explain THIS:
#law

