This map of Nebraska Territory, May 1854-1954. It also includes its territories established May 1854 and authenticated by the Nebraska State Historical Society. This map prepared courtesy of the First National Bank of Omaha, the oldest national bank from Omaha West. what makes this map unique is that it includes the Mormon, Oregon, Ox Bow, and California trails all routes of the Lewis & Clark, Mallet Brothers Long expeditions and historical sites.