Determining whether someone is a U.S. citizen at birth is very fact-specific. This is especially true given there have been sevetal changes to the law. There is much more information needed. You would be best advised to schedule a consultation with an experienced immigration attorney to discuss the matter further.
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Possible, but needs a thorough examination of the facts and building of the case, if an"case" there is by an experienced immigration lawyer.
Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.