Yes, after their successful domestication of zebras, black Africans learned of a related species in Eurasia so came north to offer their expertise to those who wanted to domesticate the horse.
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BTW, pants were not invented until the horse was domesticated and horseback riding became common.
Zebras are inifinitely more difficult to domesticate - even now people aren’t able to do this. Horses - at least the ancestral ones (think Przewalski’s horses) are far smaller and easier to control