Where did horses originally come from?
The fact that horses became extinct in their continent of origin
and were reintroduced has caused some people to mistakenly believe
horses originated elsewhere in the world, but actually they
originated in North America.
It is believed that some modern horses (E. Caballus) migrated
across the Bering Straight land bridge into Asia and on into
Europe. Starting with Columbus, Europeans such as the Spanish,
brought horses back with them as they colonized North America.
correction: They did not originate in North America if they
crossed the Bering Strait from Asia. Asia would be the best guess
for the origination of horses.