To be born a citizen of the US, one must be born exclusively "subject to the jurisdiction, thereof", simply stating, not subject to any foreign power.<quoted text>
Here is a decision by the US Army Judge Advocate General's office that says that a US-born child whose father was a German citizen who was never naturalized is a Natural Born US Citizen. And it specifically says that dual citizenship does not affect the situation.
Moreover, sadly you have not been following CONSERVATIVE legal principles. Conservatives have always said that foreign laws do not affect, and cannot be allowed to affect US laws. And in the case of dual citizenship that is exactly right, US law does not allow foreign laws to affect US Citizen status (or as the JAG ruling shows, NBC status), and yet you think that they do.
Well, that is giving entirely too much power to foreign laws, a most non-conservative thing to do. And besides, it is not the law, foreign citizenship laws simply have NO effect on US citizens in the USA.
With $2.00 and the JAG's opinion, you might buy a beer.