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Idaho Territory was an organized territory of the United States which existed from 1863 to 1890. The territory was officially organized on March 4, 1863 by Act of Congress, and signed into law by President Abraham Lincoln. It was created by areas from existing territories; the area west of the Continental Divide was formerly part of the Oregon Territory and Washington Territory, whereas most of the area east of the Continental Divide had been part of the Dakota Territory. The original territory covered most of the present-day states of Idaho, Montana and Wyoming. The first territorial capital was at Lewiston. Boise was the territorial capital from 1865. In 1864, the Montana Territory was organized from the northeastern section of the territory east of the Bitteroot Range. Most of the southeastern area of the territory was made part of the Dakota Territory. In 1868, the areas east of the 111th Meridian were made part of the newly created Wyoming Territory. Idaho Territory assumed the boundaries of the modern state at that time. The territory was admitted to the Union as the State of Idaho on July 3, 1890.
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