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The Territory of Montana was an organized incorporated territory of the United States that existed from May 26, 1864, until November 8, 1889, when it was admitted as the 41st state in the Union as the State of Montana. ==Original boundaries== (詳細はIdaho Territory by Act of Congress and signed into law by President Abraham Lincoln on May 26, 1864. The areas east of the Continental Divide had been previously part of the Nebraska Territory and Dakota Territory and had been acquired by the United States in the Louisiana Purchase. The territory also included a portion of the Idaho Territory west of the continental divide and east of the Bitterroot Range, which had been acquired by the United States in the Oregon Treaty, and originally included in the Oregon Territory. The part of the Oregon Territory that became part of Montana had been split off as part of the Washington Territory. The boundary between the Washington Territory and Dakota Territory was the Continental Divide (as shown on the 1861 map); however, the boundary between the Idaho Territory and the Montana Territory followed the Bitterroot Range north of 46°30′ north (as shown on the 1864 map). This change was due in part to Congress unifying the area with the creation of Idaho Territory in 1863, coupled with the subsequent political maneuvering of Sidney Edgerton, soon to be the first Territorial Governor of Montana, and his allies in the Congress. They successfully implemented the boundary change that won the Flathead and Bitterroot valleys for Montana Territory.〔Malone, Roeder, and Lang 1991, p. 95.〕 The Organic Act of the Territory of Montana〔An Act to provide a temporary government, 1864.〕 defines the boundary as extending from the modern intersection of Montana, Idaho, and Wyoming at: The forty-fourth degree and thirty minutes of north latitude; thence due west along said forty-fourth degree and thirty minutes of north latitude to a point formed by its intersection with the crest of the Rocky Mountains; thence following the crest of the Rocky Mountains northward till its intersection with the Bitter Root Mountains; thence northward along the crest of the Bitter Root Mountains to its intersection with the thirty-ninth degree of longitude west from Washington; thence along said thirty-ninth degree of longitude northward to the boundary line of British possessions. The boundaries of the territory did not change during its existence. It was admitted to the Union as the State of Montana on November 8, 1889. Image:Wpdms washington dakota territories 1861.idx.png Image:Wpdms idaho territory 1863 idx.png Image:Wpdms idaho territory 1864 legend idx.png File:DeLacy Map Montana Territory 1865.JPG|de Lacy's 1865 map of Montana Territory File:W deLacy Map Montana 1872.jpg|de Lacy's 1872 map of Montana Territory 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Montana Territory」の詳細全文を読む スポンサード リンク
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