i think i just heard a million aneurysms. but, science is about data. and, sometimes, that data is upsetting. pointing out historical fact doesn't uphold any kind of racial theories.
did it work? well, statistics around black americans - very narrowly, very specifically - consistently pull out traits that are not replicated in black caribbeans or black africans. these differences are often explained via cultural differences, and i actually don't wish to reject that as a substantive factor.
but, it seems like these breeding experiments were not entirely unsuccessful - although this observation is better understood as an argument against racism, and not in favour of it. the same thing would happen i you took any other group and artificially selected for the same traits.
and, that's actually something that makes me angry, too. i share your indignation on this.
jagmeet singh must cut his beard