I don't think anyone can beat the British Empire. 20% of the world's land area, the most powerful Navy the world has ever seen.... the USA can only vie for 2nd place.
Americans are not 'gods'. If China ever becomes as productive as them, with the current population they will have a GDP 4.3x that of the USA.
Why not? Asian Americans do better than the builders of America (Whites) on almost every scale. East Asians have also built great societies like the Whites. Anyone who goes to Singapore, Japan, South Korea, Hong Kong, or Taiwan cannot, if they don't have an underlying bias, say these countries look much different from Western countries (or in some cases, better).
China is the very last of the East Asian countries to develop. I have not seen a single person refute the hypothesis that they will converge with other members of their race sooner or later. Even if they collapse, it matters not. They will simply rise again and converge with the West and their Eastern cousins.