Ranchers formed the territory of Cimarron in 1887; it lasted until 1890 when it became this state's western panhandle
[DOC] [TLE] New Mexico Office of the State Historian : Union County, A History of [PAR] Their headquarters for New Mexico was on the Cimarron , near the ... At the 
Pitchfork ranch, situated three miles west of the present town of Clayton, .... [25] 
The small cattlemen in Union county from 1890 until 1900 let their cattle range 
together.