A New Mexican rancher , Kelly Stephenson , found wild burros grazing on his land and on the federal land where he had a grazing permit .
The state of New Mexico challenged the federal government 's authority to manage wild horses within the boundaries of New Mexico .
A New Mexico   rancher , Kelly Stephenson , found wild burros grazing on his land and on the federal land where he had a grazing permit .
The state of New Mexico challenged the federal government 's authority to manage wild horses within the boundaries of New Mexico .