European civ has been more successful for the reasons well stated by Jared Diamond in his seminal work "Guns, Germs and Steel". No racial differences were required to create the dominance of the White man in those situations.
Look how the White march down Africa stalled and collapsed. White success in Africa was only created by leapfrogging via the ocean onto coastal areas of similar climate to Europe.
LATITUDINAL GEOGRAPHY is what creates successful cultural expansions, not longitudinal ones. The White Power chumps will never admit that, however. They just hate n1ggers.