Statistics for occurrence #1 of “Territory of Idaho” in entry idaho of Harper's Encyclopedia of United States History:
...ablished in 1842.
The region was visited almost exclusively by hunters and trappers till 1852, when gold was discovered on its present northern boundary.
By act of Congress of March 3, 1863, the Territory of Idaho was created from a portion of Oregon Territory, with an area which included the whole of the present State of
Montana and nearly all of that of Wyoming.
In 1864 the Territory lost a part of its...
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.