History of the horse:

In the case of human beans, I believe their history begins way before their evolution as a species. In fact begins with the emergence of the first living form. In any case since all of this still a mystery we will have to start with what we know about the first horse ancestors.
The evolution is in fact a very interesting process, the natural selection started to modify each different specie base upon: the geographic area of habitat, the predators against they were exposed, the food that was available and many other factors achieving the formation of new species and desapearing of those species that were not strong enough to survive.
This is the reason why the anatomy of the horse is so unique. It is the final result of the environmental influence in which it developed.
The modern horse (Equus caballus) took aproximately 60 millon years to evolve. Its most recent ancestor: the Eohippus, “dawn horse” was the one the gave origin to the Equidae family. Within this family we encaunter: the cebra, the donkey, the domestic horse likewise the donkeys of Asia, Africa and the wild horse of Przewalski

The Hyracotherium, best known as the Eohippus was wery different compared to the actual horse neither in size nor in characteristics. Its average length was 35cm to the cross, weigthed about 5.5 kilograms, practically like a dog!! Its back was arched and instead of having a finger protected with a helmet it had a hand with a beefy plant, 4 fingers in the front legs and 3 in the rear legs. Its teeths were adapted for the consumption of soft tree leaves and its eyed were also different due to the fact that were located more towars the center of the head lacking a good lateral vision (actually serves as a defensive mechanism for the horse), but the Eohippus did not need that because in the wild environment in which it lived its camouflage was an effective way of evading predators.

Natural Bridges: A lot of people think that horses arrived in America during conquer time, but this idea is not completely true. During the Eoceno period , at the beginning of the equine evolution, Northamerica was already inhabitated by the ancestors of the Equus caballus. At that time the American continent was connected to Europe and Asia through natural bridges that lasted to the end of the glecier era aproximately the year 9,000 B.C. These natural bridges allowed that for more than a million years migrations occurred among Equus species towards what we know as the Old World. When the gleciers melted America was isolated from other continents and thousands of years after, by unknown causes, horses were extinguish completely from this continent.

All four species related with the Equus were distributed in the following way: Horses in Europe and west Asia, donkeys and cebras norht and south of Africa and onagros in the middle East.
Arrival to the new world: In 1492, Cristobal Colon arrive to the american shores. By this historical fact new and crucial events took place, one of them: the Equine reconquest due to the fact that horses accounted for more than 25 million 400 hundred years after the American discovery.
Cristobal Colon during his first expedition left 30 horses in the Spanish island and shortly after that this number was multiplied considerably. Years after Hernan Cortes arrive in Mexico with 16 horses, 11 studs and 5 mares. Among this horses was El Morzillo that belonged and was used by Cortes during a long time.