China's huge population doesn't matter that much becaue the mongoloid race is physically not that strong. They don't have body hair, have weak eyesight, weak jaws, small penis size, short stature and weak physical prowess in general.

The vaunted Japanese army in ww2 had an average height of 5 feet.

In contrast, tiny west indies islands rake in gold and silver medals hand over fist because they have west African populations that underwent a significant eugenic process. Pure black nations in Africa don't do any well in the olympics but carribean blacks do.

My guess is that slavery for sugar plantations had a very eugenic effect. 11 million negroes were imported by spain to those islands and 90% of them died. Only the strongest and most physically virile most likely survived the rigors of sugarcane farming.

Blacks also have a natural advantage in the area of athletics and sports since most of sports involve sprinting. Blacks were evolutionarily selected for sprinting. Nordics are the physically strongest race and they dominate strongman competitions with slavs being neck and neck with them.

Despite the sterotype of the Italian stallion and the Spanish bull, of these countries' men being the most virile lovers, they are the physically weakest Europeans. The ancient Romans noted that Gauls and Germans would generally always win in single combat against Romans. But Romans beat them in war due to superior organization, equipment, greater money and manpower reserves.

In any case, the US becoming 50% white doesn't matter in terms of olympics because the absolute number whites is still there. There are still 190 million whites in America and theoretically Brazil has 90 million.

In any case, the olympics or sports don't really matter. Japan or south korea wins few medals compared to the West Indies but no sane person would say they are weaker countries than Jamaica or Trinidad.