Johnson and Ward. “Johnson’s Washington, Oregon, and Idaho.” 1864. 13 5/8 x 15 1/2. Lithograph. Original hand color. Very good condition.
An updated version of Johnson and Ward’s map of the Northwest showing new political boundaries illustrating the introduction of the Montana and Dakota Territories. The middle and northern sections of Idaho’s present eastern boundary approximate what is shown on this map, but the south-eastern section extends to the 110th meridian, apparently until Wyoming came along. Interestingly, the eastern boundary lines to the north are credited to the influence of one man, Sidney Edgerton, an Ohio congressman, who relocated to the Idaho Territory for a judicial appointment. Originally, the Idaho legislature had proposed that the eastern border follow the Continental Divide. Feeling jilted with his placement in the north of the Territory east of the Rockies, Edgerton exercised his influence in Washington and allied with his neighbors in Montana to push the state line westward, from the Rocky Mountains to the ridgeline formed by the Coeur d’Alene and Bitterroot Mountains.