Why do some study programs accept none to only one black person?

I have realized that in most predominantly white institutions, there is a high lack of diversity even when many people from all ethnicities apply for some study programs. Like only 1/20 get accepted for black people (or non-white people in general) and like 40/50 of white people get accepted instead.

Why is that so? We live in 2022, I though diversity was a thing nowadays. Especially for universities.
Why do some study programs accept none to only one black person?
Why do some study programs accept none to only one black person?
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