found: Wikipedia, Aug. 12, 2008:Idaho Territory (Idaho Territory was an organized territory of the United States which existed from 1863 to 1890; officially organized on March 4, 1863; 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; original territory covered most of the present-day states of Idaho, Montana and Wyoming; 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; territory was admitted to the Union as the State of Idaho on July 3, 1890) Washington Territory (The original boundaries of the territory included all of the present day State of Washington, as well as northern Idaho and Montana west of the continental divide. Upon the admission of the State of Oregon to the union in 1859, the eastern portions of the Oregon Territory, including southern Idaho, portions of Wyoming west of the continental divide (then Nebraska Territory), and a small portion of present-day Ravalli County, Montana were annexed to the Washington Territory. In 1863, the area of Washington Territory east of the Snake River and the 117th meridian was reorganized as part of the newly created Idaho Territory, leaving the territory within the current boundaries of the State of Washington)
