[AnotherUnixGeek]

to the equestrian nations of the American Great Plains, horses were the engines of the ancient world.

The "equestrian nations of the American Great Plains" were a relatively recent and short-lived by-product of European settlers, who introduced horses to North America.

[John Milner]

to the equestrian nations of the American Great Plains, horses were the engines of the ancient world.

The “equestrian nations of the American Great Plains” were a relatively recent and short-lived by-product of European settlers, who introduced horses to North America.

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I was going to point out the same thing. The horse was introduced to the Americas by the Europeans. The horses the native Americans rode were descendants of those that escaped from settlers, formed wild herds after they’d begun to lose their domesticated characteristics. With rare exceptions. Nothing ‘ancient’ about them.