<p>I think the point is not - for those who are US citizens - that you need to reveal that you also have citizenship elsewhere in order to be honest. No one will care. </p>
<p>I think the point is - it is cool, unique, possibly a hook, to have dual citizenship somewhere else (Israel, UK, where-ever - don’t Greece and Croatia also allow people born there to be dual citizens?) - so by all means, mention it on your application. It might give you a bit of an edge. An admissions officer might think you are adding a little bit of extra diversity to their student population.</p>