how to check if you're a us citizen?
When you tell DHS that you believe you are a U.S. citizen, unless you are a U.S. citizen by your own birth in the U.S., ask for an N-600 form. We discuss this form in more detail under Step Two. If you think believe you are a U.S. citizen by birth in the U.S., you will be asked to present your U.S. birth certificate.