Idaho Territory is organized by the U.S.…
March 1863 CE
It is a successor region that is created by areas from existing territories undergoing parallel political transitions beginning with disputes over which country owned the region; by 1863 the area west of the Continental Divide that was formerly part of the huge Oregon Territory (by now some was a state) had been sundered from the coastal Washington Territory north of the young State of Oregon to the far west and the remnant of the Oregon Territory had been officially 'unorganized'—whereas most of the area east of the Continental Divide had been part of the loosely defined Dakota Territory ending along the 49th parallel, demarcating the colonial possession of Great Britain; today the U.S. border with Canada.
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