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Building on a similar thread a week ago, which asked about a world without Indo-Europeans, here`s a specified What-If:
At the end of the 5th / beginning of the 4th century BCE, weather in the Eurasian grasslands became drier. Cattle herders there had increasing problems. Horses were at the top of their diet, too. In this process, domestication of horses occurred, too. (Perhaps in the Sredny Stog culture? Let´s go with that assumption.) What if the domestication of the steppe horse had not succeeded, though?
What if, instead, the steppe dwellers - regardless of whether they spoke Proto-Indo-European, or some Uralic, Caucasian, ... language - had hunted Eurasian steppe horses to the point of extinction?