It's no secret that some admissions are received because of legacy, donor, and athletic considerations. But I've never seen information providing actual numbers.
And I've never heard about Indians, Hispanics, etc., given special treatment in admissions.
Can you provide some links to support your claim that "Yet far more admissions slots" are set aside for those people.
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Information can easily be found which shows the extreme preferences given to blacks. Some were covered earlier in this thread.