39th meridian west from Washington

The 39th meridian west from Washington is an archaic meridian based on the Washington meridian. The meridian is used as a boundary for two states.

The partition of the Idaho Territory which made the meridian a boundary

The first and only usage of the meridian as a boundary occurred in 1864. In that year, the Montana Territory was created from Idaho Territory with the meridian serving as its extreme northwestern boundary.[1] Montana became a state in 1889, with Idaho following the next year.[2][3]

References
  1. 13 Stat. 85
  2. 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.
  3. "History". State of Idaho. Archived from the original on 19 May 2014. Retrieved 16 May 2014.

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