<p>My maternal grandparents that were born in Spain never renounced their citizenship when they became naturalized. My father who was born in the dominican republic also has not renounced his citizenship. I do no think that the US government enforces this rule. Other countries allow dual citizenship, and do not accept renunciations of their citizenship. </p>
<p>I think that mentioning your dual citizenship will be an edge for you, because colleges are looking for diversity and people from all places.</p>