The 39th meridian west from Washington is an archaic meridian based on the Washington meridian. The meridian is currently used as a boundary for two states.
The first usage of the meridian as a boundary occurred in 1861, when Nevada Territory was created from the western part of Utah Territory. Initially, the eastern boundary of Nevada Territory was set at this meridian.[1] However, in 1862, that boundary was moved a degree east to follow the 38th meridian, and a few years later was moved still further east to the 37th meridian.
The 39th meridian was used again for a boundary in 1864. In that year, the Montana Territory was created from Idaho Territory with the meridian serving as its extreme northwestern boundary.[2]Montana became a state in 1889, with Idaho following the next year.[3][4]
^Holmes, Krys (2008). "Chapter 10 - Politics and the Copper Kings, 1889 - 1904". Montana: Stories of the Land(PDF). Helena: Montana Historical Society Press. p. 193.
^"History". State of Idaho. Archived from the original on May 19, 2014. Retrieved May 16, 2014.
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