I agree with Mac N Cheese. Use your personal statement to talk about what you will bring to the table. If you think your background influences what you have to offer then explain how. Otherwise, include a diversity statement that will explain how you and your background are unique. As for your URM status, in my opinion you are an URM. Don't just think of it as a label that someone else (society) would give you. Think of it has how you view yourself, your culture, and your background. You know that there probably are not too many North Africans in American Law Schools lol!