The39th meridian west from Washington is an archaicmeridian based on theWashington meridian. The meridian is currently used as a boundary for two states.
The first usage of the meridian as a boundary occurred in 1861, whenNevada Territory was created from the western part ofUtah 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 the38th meridian, and a few years later was moved still further east to the37th meridian.
The 39th meridian was used again for a boundary in 1864. In that year, theMontana Territory was created fromIdaho Territory with the meridian serving as its extreme northwestern boundary.[2]Montana became a state in 1889, withIdaho following the next year.[3][4]
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