Idaho Territory

Territory of Idaho
Organized incorporated territory of the United States
←   ← 1863–1890 →   →   →   →
Idaho Territory coat of arms (1863–1866)
Capital		Lewiston (1863–1866) Boise (1866–1890)
Government		Organized incorporated territory
History
•	Split from Dakota, Nebraska, and Washington territories	March 3, 1863
•	Montana Territory split off & land ceded to Dakota Territory	May 28, 1864
•	Wyoming Territory formed	July 25, 1868
•	Statehood	July 3, 1890

Idaho Territory coat of arms (1863–1866)

The Territory of Idaho was an organized incorporated territory of the United States that existed from March 3, 1863, until July 3, 1890, when the final extent of the territory was admitted to the Union as Idaho.

The territory was officially organized on March 3, 1863, by Act of Congress, and signed into law by President Abraham Lincoln. It is a successor region that was created by areas from existing territories undergoing parallel political transitions beginning with disputes over which country owned the region (See Oregon Country); 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 was 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—now the border with Canada, then a colonial possession of Great Britain.

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