A very interesting map that depicts the region with the largest extents of Utah and New Mexico territories. Utah Territory encompasses all of today's Nevada and extends east to the Continental Divide into present-day northern Colorado with Fillmore City as its capital. Kanzas is to the east of Utah Territory. New Mexico Territory stretches between California and Texas and includes part of present-day southern Colorado and the southern tip of Nevada. In the south of New Mexico in Dona Anna county is the notation "Disputed Territory About 6,000 SQ Miles" and the important survey line of Conde & Barrett at 32° 22' is delineated. After the Mexican War the United States appointed John Bartlett to work with Mexico's Pedro Garcia Conde as official boundary commissioners to direct the surveying and establishment of the new international border. They found two major errors in the Disturnell's 1847 map that was used as a reference during negotiations for the Treaty of Guadalupe Hidalgo. Delineates Fremont's routes, proposed routes for the Pacific Railroad, the Spanish Trail, the Cimarron Trail, the Oregon Route 1843, and more. A fine example of a very desirable map that Wheat found important enough to use as the frontis to Volume 4 of his Mapping the Transmississippi West. This is the fourth state of the map, with the plate number 53 in the lower right corner and the plain border of the General Atlas. Copyright date 1855, but published in circa 1857. Text related to California on the verso.

References: Brown (Portolan, Spr. 2005) pp. 50; cf Wheat (TMW) #832 (frontis).

Condition: A

Fine color and impression with wide margins. No flaws except a light line of offsetting parallel to and outside the borders.