These noble sportsmen from the Asante Empire in West Africa are on a hunting safari out in the American West sometime in the 19th century. I wouldn’t know how plausible such a scenario would be during that time period, but if you had all those rich White dudes traveling to Africa to shoot at the local wildlife, it seems only fair to me to have African nobility venture to North America for similar adventures. From their point of view, animals like bison, deer, and grizzly bears would be every bit as exotic as African buffalo, antelope, and lions would be to Americans.