Congratulations! You will become a U.S. citizen automatically when you enter the U.S. as a lawful permanent resident while under the age of 18 years. Since your father was not a U.S. citizen when you were born, you did not automatically become a U.S. citizen at birth. If you had been present in the U.S. as a permanent resident when your father naturalized, you would have become a U.S. citizen on that day. So, you will need to enter the U.S. with your green card before you can become a U.S. citizen. After you enter, you can either apply for a U.S. passport or a Certificate of Citizenship to prove your citizenship.
Answered on Aug 30th, 2011 at 1:53 PM