People that go to those very top schools in their region, like Harvard or Vanderbilt. are they really smart or parents just rich?

Update: can explain? btw, I think George W. is a perfect example, he looks like such a dumb A s z , but however I was in one of those top ivy league schools.how it happened? (only in American right?)
Update 2: Btw, is Vanderbilt a top university in the USA? is it like Harvard nearly? or how compared? I am just using that one as it is close to me. Everyone I knew in high school was thinking Vanderbilt was like the golden road to sucesss
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