Wild horses in North America are a very interesting question. All equids evolved in North America. For tens of millions of years they were here, and only have

Wild horses in North America are a very interesting question. All equids evolved in North America. For tens of millions of years they were here, and only have been gone for ~10,000 years until being reintroduced by the spanish. [1] [1] See the fantastic book "Twilight of the Mammoths"