Is all non-Sinospheric history a giant clash between NW Eurasians and SW Eurasians?
I used to scoff at the old Nazi idea of a perennial fight between "Aryan and Jew" (whatever the fuck that means considering they barely ever equated Judaism with Christianity), but if we look strictly at the conquests of Eurasia, they might be divided into two groups:
north-western: cutiePIE (3k BCE), Graeco-Roman (300 BCE) and imperialist (1900 CE);
south-western: Zoroastrian (500 BCE), Judaeo-Christian (300 CE), Islamic (1200 CE).
The north-westerners got routinely cucked and lost vigour (outside Aryavarta), whereas the south-westerners keep chugging along - the Persians subsumed Babylonia, the Muslims subsumed Persia, eventually broke into Anatolia (1071), India (1200) and Indonesia (1500), they're all still there. Even the steadfast Hindus have only survived by sheer numbers - and they did lose out culturally (and militarily) to Muslims in Indonesia.
If you look at it this way, the idea that Europe is oh-so inexorably dominant and West Asia is forever marred in internecine strife and zeal is missing the larger picture. While in the past the invasions might have followed one another sequentially, ever since the fall of Rome, this European domination of 1900 CE was the only outburst from the North - and yet it was nevertheless marred in the underlying Judaeo-Christian foundation which was still omnipresent. The attempt was made for a true revival of the northwestern Eurasian conquest of old under Hitler in Germany (the massive genocidal deluge of Barbarossa known in America as the Holocaust) but he failed to gain traction on the scale of civilization, and was defeated by the Christian half of the European culture in a massive reactionary civil war.
Under this view, Islam might have decayed and lost ground in 1700-2000, but it's of little import when the Judaeo-Cheistian giant was the one which benefited. The main enemy - the "North-West" - remains dead and buried. And thus the global trajectory has stayed the same ever since Emperor Julian's demise in 363 CE. And I'm not sure if India can truly represent this ancient NW conquest either - in fact, it used to spread its culture all over Indonesia in a diffusion of its own. The only distinct culture to itself is obviously the Sinosphere. But all to the West of the Indus is a done deal.