Mitchell's second edition of this map now shows the newly created territory of Idaho which extended to Dacotah Territory and in the process clipped Nebraska's panhandle to today's configuration. In this configuration Idaho occupies most of Wyoming and Montana. It locates the Big Horn Mountains, Pilot Butte, and the important Cheyenne and South Passes. The map still names the short-lived PONY EXPRESS route. Locates numerous Indian tribes, forts and a trading post. County development in Kansas and Nebraska is limited to the eastern edge, with several counties added to Nebraska over the 1860 edition. There are 38 counties named in Kansas including Hunter County which dissolves into part of Butler in 1864. Wheat says this map is an early mapping of Colorado with numerous early county configurations including a large area in the east-central region "Reservations of the Cheyennes and Arapaches [sic]." The central feature of the map is the Gold Region shown adjacent to Denver City. The map locates other cities and mining camps including Golden City, Central City, Boulder City, Colorado City, Canon City, Fountain City and Breckinridge.

References: Wheat (TMW) #1030.

Condition: A+

Very nice example with full margins, strong impression and bright original color.