I was born to a German mother and an American father in Germany. I have a German birth certificate and have my entire family still living in Germany. I understand that under the Nationality Act, my father would have had to have been German for me to receive citizenship or my mother would have had to apply. I was born in 1970. So, I recently found out that under section 14 of the German Nationality Act, that I can be naturalized as a German citizen. I would like to know how I can keep my US citizenship as well? I understand that there are provisions under the law, but what could justify keeping both passports to the satisfaction of the German authorities?