God.
Sorry, couldn't resist that one... seriously though, they were brought over by Christopher Columbus and came from the Ukraine / Central Asia region.
Actually most horses are native to North America and migrated over to Asia and Europe. They were reintroduced by Christopher Columbus. Sorry.
It depends on which type of horse you're talking about.
Horses
Southern california
The Lakota which were originally called the Dakota. Were introduced to horses by 1730 by the Cheyenne and have used horses ever since.
Pinto horses are originally from Spain.
Spain
Argentina
Not originally. They used rafts and a kind of grag sled.
Horses are originally from the west prairies.
This is originally the Greek name Hippolytos, meaning "Looses ( frees) the horses."
Horses developed over the North American and Eurasian continents. They did not come from one specific country and we reintroduced to the Americas by the Spanish explorers.
The horse family is a small one, which includes only horses, donkeys, mules and zebras. Many members of this family are extinct. Modern horses are beloved family pets, but horses were originally kept only for their ability to work.
They originally come from the Netherlands but can now be found in other places around Europe and beyond.