This is an uncommon edition of Colton's great map of the American Southwest featuring the territories in transitional states. The proposed Territory of Arizona is shown occupying the southern part of New Mexico extending from Texas to California. The newly proposed Nevada Territory is shown taking in the western part of Utah with the border at the 116th meridian and extending south only until the 37th parallel. Colorado Territory appears at right. 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 but published circa 1861.

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Condition: B

On a lightly toned sheet with minor foxing and a couple of light stains. There are some tiny edge tears that have been closed on verso with archival tape.