Trebuie sa citesc o revista din 1939 (si apoi sa caut pe net) ca sa pot afla asta:
When did the first horse arrive in North America?
The first horses, about the size of a large German Shepard dog, roamed the prairie's around the Wyoming and Montana territories around 15 to 17 thousand years ago. For some reason, maybe early man hunting them, they disappeared. Then again the early Spanish explorers setting across the Southern United States on their quest to find the seven cities of gold brought horses with them. These were the first of the new Mustangs that now roam the entire Southwest.