The Idaho Panhandle region had been part…
November 1864 CE
The Idaho Panhandle region had been part of Washington Territory from its founding in 1853 until the formation of Idaho Territory in 1863.
The Territory of Idaho is much larger than the later state of Idaho, including all of modern Montana and most of modern Wyoming.
The panhandle is created when the Montana Territory is organized from the Idaho Territory in 1864.
Residents of the panhandle declare the move illegal and propose secession.