Horseluvr, you are exactly right with your answers.
YLL, it sounds like you know your Appys!
I was looking for the NW US area of Washington, Oregon and Idaho, the Palouse Valley area. You were right about the coat markings and the Nez Perce Indians.
I meant the oldest domestic horse breed, one that would have papers rather than the wild horses. Sorry if I wasn't clear on that. Anyone want to guess again?

YLL, thanks for posting the answers to you questions, I wasn't sure about any of the cart names.