If a person is not a US citizen per US law, that person must be naturalized in order to become a US citizen. It has nothing to do with foreign law. Even a stateless person who is not a US citizen would need to be naturalized in order to become a US citizen. Foreign law is irrelevant.<quoted text>if foreign law has no force, why do we have a naturalization process?
He wasn't born a subject of another nation per US law, under the US Constitution. US law is concerned with who is a citizen or who is not a citizen per US law, and is not dependent on foreign law. Foreign law has no force or effect within the US. The US is a sovereign nation, not a British colony. Sorry, British law cannot determine who is a US citizen.