<p>I think we need to define terms here. All minorities are not URMs. I highly doubt that Princeton and Yale are anywhere near those percentages of URMs. That they may have that many minorities is a different issue, and as Calmom says, there's no reason to suppose these students were picked for any reason beyond academic qualification. </p>
<p>I don't think it's necessary to be a member of any specific group or activity to increase one's "odds": I think you should be your best you, and let the chips fall where they may.</p>