Ive pondered somthing like that before and let me give you my opinion:
If you were born in the US with Dominican born parents and you grew up speaking spanish first and learning all the customs and culture of DR, then there is no reason why you shouldnt be considered a "TRUE" domincan.
Here is a case with one of my friends who is Puerto Rican......(dont worry, im only making a point, it can apply to any nationality, so to the harsh people dont jump on me because i am mentioning PR).......Anywayz, His parents were Puerto Rican and they both sadly died of aids but my friend didnt have it and he has been raised by his grandmother, aunts, uncles in different times and recently during his teem years been living with a friend of his. He doesnt know spanish, he doesnt know the culture that much and has never been to P.R. and we grew up in NYC so he knows the tough ghetto street but still managed to recently graduate HS on time with me.....
..... My point is that i never considered him Puerto Rican that much because he didnt grow up PR. He may look it but he doesnt have any other "characteristics" of it. Thats 1 view.
Another view is lets say there is a Haitian. He is born in Haiti and immediatly moved to DR as a baby. So he grows up "Dominican" and knows spanish and everything else about being from DR. If you were to meet a guy like that, WHAT WOULD YOU CONSIDER HIM? I would have to say Dominican because that is all he knows and thats his mindset.
What would the rest of you consider this man, Dominican or Haitian?
P.S. What would you consider my freind?