race doesn't mean anything. the height of childish thinking is basing anything on pigment.
of course you have populations that have concentrated traits, like Scandinavia with strong men, Caspian with abstract thinking, some West African tribes with fast twitch, Eskimo with double layer of fat, etc. etc.
Ethiopian's are a complicated bunch,. but the shotgun of thousands of DNA samples finds that they are a mixture of eurasian, semetic and sub sahara peoples, and all of those generalizations of peoples have a vast varying genetic profile.
Other African tribes are much closer to the average south european profile than say, the bushmen or Sudanese,
West Africans can be quite a mix of europeans, Berbers "white ancient inhabitants", various diverse African ,, with a massive amount of Arabic genetics.
But sure,. functionally speaking,. in Kenya with most of the runners coming from a small area. one can generalize about genetics.
in the 1500, there is no evidence that Africans have an advantage at the moment. when you had like 4 top 1500 guys from Kenya,. then the bro science theory becomes it is obvious black mountain africa dudes are superior. everybody might as well give up,. they have no chance with their lousy white / asian or whatever genetics.
the world cliche of them all is the white people can't jump one, which ignores the fact that most of the best jumpers come from europe, and chinese had multiple world records in the jumps in the past. hello jonathan edwards. this goes for dunking a basketball, go watch a soccer game.
that said of course the American "black" population has a concentration of fast twitch and cerebral coordination and rhythm.
but you can find those genetics anywhere in the world, where the frequency is less to far less than other populations. i.e. finding a world beating Eskimo 400m runner.