The original native equines in the Americas died out long before any humans got here.
Every "wild" (actually feral) horse in the West is descended from a domesticated horse that was turned loose at some time in the past - maybe there are still some descended from horses brought by the Spanish conquistadors, but most are from horse owners fallen on hard times, by chance escaping from a ranch herd, etc. Most of them are just random mixed breed - what used to be called a "grade horse".
“Actually, they technically are an invasive species - that’s a term of art.
The original native equines in the Americas died out long before any humans got here.”
This is why I like visit this site. There are people here who are smarter than I am and from whom I learn quite a bit.
Thank you