This is a rare issue of Colton's great map of the American Southwest featuring the territories shown in transitional states. The proposed territory of Arizona is shown to the south of New Mexico, with New Mexico extending from Texas to California. The newly proposed territory of Nevada is shown taking in the western part of Utah with the border at the 116th meridian, and extending south only until the 37th parallel. The territory of Colorado appears at right. No counties are shown in either Nevada or Colorado. The map locates numerous early exploration routes, mail routes and proposed routes for the Pacific Railroad. Surrounded by Colton's distinctive scroll border. Dated 1855, this was published circa 1861.

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Condition: B+

Original color with very light toning, some show-through of text on verso, and a couple of minor spots.