This depends on how you derived US citizenship. Probably proof of your parent(s) US citizen, your birth certificate and proof that your parent(s) meet the physical presence requirement. For more information on derivative citizenship, please see http://www.avvo.com/legal-guides/ugc/obtaining-citizenship-through-parents-and-grandparents
Mr. Shusterman's (former INS Trial Attorney, 1976-82) response to your question is general in nature, as not all the facts are known to him. You should retain an attorney experienced in immigration law to review all the facts in your case in order to receive advice specific to your case. Mr. Shusterman's statement above does not create an attorney/client relationship.
talk to an immigraiton lawyer in the USA before you go there.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.
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