Dear colleague, you vividly demonstrate the widespread ignorance of elementary physical differences among human populations - which explains why ordinary people easily succumb to ridiculous mythologies, when watching track and field meetings on TV.
What is the most critical physical requirement for the success in most world sports? It's body height because in most sports you must reach and throw further, jump higher, lift more. And all these performances increase, when your body is larger. Short height is important only when your body itself is the subject of the sports performance (such as in gymnastics, diving or trampolining).
And who are the tallest people in today's world? Believe it or not, it's Europeans, who have utilized the 150-years long benefits of the industrial revolution. The current average height in Europe is about 178 cm in men - it's ussually below this value in Western Europe, the Mediterranean, and in the Eastern Balkans, but above it among Germanic-speaking populations (ca. 181 cm in Scandinavia, 182 cm in the Netherlands, 180 cm in Germany), Balkan highlanders (183 cm in Montenegrins, 181 cm in Bosnians, 184 cm in Dalmatians and Herzegovinians), and in the Baltic nations (182 cm in Estonians).
In contrast, most world nations still essentially remain in the middle ages: The tallest nation in Asia are Lebanese with less than 176 cm in men, followed by Israelis (175 cm) and South Koreans (174 cm). The mean male height in one-billion China is 172 cm at most, and in India it is even lower (165 cm). With the possible exception of South Sudan, for which actual data are missing, the situation in sub-Saharan Africa is similar: 176 cm in Senegal, 175 cm in Mali, 174 cm in Libya, Algeria and Tunisia. BTW, the mean height of Nigerian men is ca. 172 cm, and in almost the whole of sub-Saharan Africa, height has been decreasing as a result of the imbalance between quickly growing populations and resources. No black population of West African descent living in Western countries is taller than 177 cm (in USA and UK) - and the height in both US blacks and US whites has decreased by ca. 1 cm during the last two decades, as a result of flawed nutritional policies and fast food lifestyle.
And what about the athletic marvels from the Caribbean?
Dominica, St. Vincent and Grenadines, Grenada, Cayman Islands: 177 cm; Jamaica: 176 cm; Barbados, Bermuda, St. Lucia, Trinidad and Tobago: 175 cm; Dominican republic: 172 cm; Cuba: 171 cm. All the small island countries benefit from tourism, small population size, and the relative abundance of "the gifts of the sea". But when the population becomes too large (Cuba), all these positive factors cannot feed the whole nation.
Now, when we calculate a mean of world finalists in 20 male athletic events, we will typically get 184 cm. Fifteen of these events require average height above 180 cm, ten require 185 cm and more. And the mean height in the 400 m (184 cm) should actually be above 185 cm as well because it decreased only very recently, due to the influx of athletes from the exotic Caribbean nations. The three major events depending on raw speed (100/200 m, long jump) in which Western African populations have a physiological advantage, do not have too high height requirements (183-184 cm), but the 400 m hurdles need 186 cm, triple jump and 110 m hurdles need 187 cm. So how is it possible that these athletic events are full of athletes from short-statured, little populous nations that have no remarkable sports potential on the per capita basis? Isn't the whole athletics rather a joke resulting from the combination of heavy doping and negligible participation of certain world regions?