http://www.wildergarten.com/wp_pages/articles/birthright_citizenship.html
OK, but that means repealing the 14th.
Not insofar as birthright citizenship is concerned.
Sorry, that article doesn't address the question. As a practical matter, if someone is subject to the "territorial jurisdiction" of the US how is that jurisdiction diminished because that same person may also be subject to the "political jurisdiction" of another country?
Other than diplomats do we care about other allegiances when enforcing our laws? What is the practical effect of your distinction?