Why does United States, Inc. believe it has the authority to mandate vaccination of United States citizens?
Because the citizens are considered property of the government, like a herd of animals.
A rancher can do what he wants to his herd; vaccinate them, ear-tag them, etc.
Was anyone born in one of the several states disclosed on what it means to be a United States citizen vs. an American state national?
No.
Was anyone born in one of the several states ever aware they have a choice of political status?
Probably not.
Well one of those political statuses is sovereign and the other is NOT.
"Therefore, the U.S. citizens residing in one of the states of the union, are classified as property and franchises of the federal government as an "individual entity"", Wheeling Steel Corp. v. Fox, 298 U.S. 193, 80 L.Ed. 1143, 56 S.Ct. 773
US vs. Valentine 288 F. Supp. 957: "The only absolute and unqualified right of a United States citizen is to residence within the territorial boundaries of the United States."