of course you have absolute proof of this, right? Public school, right?
there were horse...then the first Indians (we can call them Paleo-Americans) came...then there were no horses...then there were the Spanish..then there were horses...the Indians took to the idea of riding them at that time(and probably ate some too).
....whether or not the indians killed off the indigenous horses (ie. caused their extinction) is not provable....but finding horse bones with cut marks from stone tools gives science a pretty good idea that the earliest Paleo-Americans killed and ate horse (and mammoth, giant ground sloth, giant bison....etc)
Questioning and then insulting before you had the answer was not really wise. Kind of snotty, actually. Private school, right? ;-)
"In the late Pleistocene (~10,000 years ago), there was a rash of extinctions that wiped out most of the large mammals in North and South America . All the horses of North and South America died out, along with the mammoths and saber-tooth tigers. These extinctions seem to have been caused by a combination of climatic changes and overhunting by humans, who had just reached these continents. For the first time in tens of millions of years, there were no equids in the Americas."
http://www.fs.fed.us/rangelands/ecology/wildhorseburro/whb_faqs.shtml
Ah.. but the Camel, and it's entire family, originated **only** in North America.