This magnificent 1864 hand colored map of Washington, Oregon, and Idaho is one of the most important transitional maps of the American Northwest published in the 19th century.  Produced just prior to the exploration of Yellowstone National Park.  What would eventually become Wyoming and Montana are included within the boundaries of Idaho.  Also noted are numerous American Indian tribes, forts, passes, topographical details, proposed railroads, mines, etc.
<bdi><a href="https://en.wikipedia.org/wiki/en:Alvin_J._Johnson" class="extiw" title="w:en:Alvin J. Johnson"><span title="19th century United-States cartographer">Alvin Jewett Johnson</span></a>
</bdi>
1864<div style="display: none;">date QS:P571,+1864-00-00T00:00:00Z/9</div>
This file was provided to Wikimedia Commons by <a rel="nofollow" class="external text" href="http://www.geographicus.com/">Geographicus Rare Antique Maps</a>, a specialist dealer in rare maps and other cartography of the 15th, 16th, 17th, 18th and 19th centuries, as part of a <a href="//commons.wikimedia.org/wiki/Commons:Geographicus" title="Commons:Geographicus">cooperation project</a>.