As the horse evolved, it first appeared on the grass lands of the North American continent. But for reasons that scientists still don’t understand, horses began wandering off North America about 10 million years ago. They began their journey across the Bering Straits (west of Alaska) into Asia, and continued across the Iranian Plateau of the Middle East and as far as Europe and northern Africa. By about 10 thousand years ago, no more horses remained on the North American continent.
The reintroduction of the horses into the Americas began in 1519 when Cortez came from Spain. As more and more settlers from Spain and other European countries came, they brought horses with them and returned these animals to their native land after a 10,000-year journey around the world.