Is Erik Voorhees a US citizen or a German citizen ?

The Constitution of the United States
Section 10 - Powers prohibited of States
No State shall enter into any Treaty, Alliance, or
Confederation; grant Letters of Marque
and Reprisal; coin Money; emit Bills of Credit; mak
e any Thing but gold and silver Coin
a Tender in Payment of Debts; pass any Bill of Atta
inder, ex post facto Law, or Law
impairing the Obligation of Contracts, or grant any
Title of Nobility.