Alceste
Vagabond
Hello Painted Wolf (btw are you Cherokee? full? mixed?),
Traditionally there are considered three macro-races of man (Caucasoid, Negroid and Mongoloid). Under each macro-race there are numerous sub-races/ethnic groups or whatever term you choose to use. As we've both pointed out there can be significant genetic differences between the ethnic groups.
The African-American ethnic group is really a hybrid ethnic group (genetically 80% transatlantic African-slaves; 20% Caucasion and very tiny Native-American).
There is no perfect way to categorize human ethnicities and it certainly is very complicated. However, that doesn't mean there are no genetic differences between let's say the Baka and African-Americans. So even though these categorizations are not perfect they are not meaningless either.
The raw traits that determine your basketball potential are things like height, muscle mass, bone size, reflexes, sprinting speed, vertical jump, physical co-ordination, etc.. The more 'raw' the trait the more genetically influenced it is. In measurement comparisons, the raw traits important to basketball performance favor African-Americans over other groups. Consequently we would expect that not all good basketball players will be African-American but that they will be over-represented.
It's astonishing that you fail to acknowledge that a culture that encourages practicing basketball - a lot - has anything to do with it. You know what else the same traits you list might determine the potential for? Cricket.
Or how about football (real football):
Or how about baseball: