The Wild Horses of the Great Basin

Horses were not used by a, aboriginal people in south america either. It was only when the spanish colonies of the southern united states started to fall apart or get raided that those horses began to be more widely distributed. What about wild populations in the west? Are those also, those also were not descendants of conquestidor horses? Oh, eventually they are. But when do those populations start? Like, when were, when we're there first, you know, herds of of wild horses running all over the great basin.