Krumm, Holman, Jacobs, are of "mixed" race
A high school footbal coach has guys run 40yd dashes to find the fastest athlete, white black or what ever. There is no socialization in that. Blacks of west African decent have the highest percentage of fast twitch therefore are faster sprinters. Im sure a coach would want to put the fastest player at speed positions regardless or race at any level.
The succcessful sprinters have almost all been of West African decent. USA, UK, Canada, Carribean, Brazil. Why are the Nigerians always considered to have the fastes soccer team in the world. Who are the fastest baseballers-Rickey Henderson, Willy Wilson etc. Where are all the superfast white basketball players who are fast as Allen Iverson, Francis, Parker, Kidd, Bryant- none never have been. What about all those midwest states, how come they dont produce superfast white athletes. Coaches there do not have the choice of putting in black kids at speed positions.
Is it just coincidence that the best distance runners we have here are of East African decent KK, Meb, etc..
What about France they have a distance running tradition there, but most of there best distance runners are from North Africa and there sprinters are west african and that pattern is true for many countries.
However, there will always be exeptions