This is an outstanding large US map.  It does feature numerous early western territorial boundaries.  Oregon and the newly created Washington Territories extend to the huge Nebraska Territory, meeting at the Continental Divide. Nebraska Territory in turn extends to the Missouri River where it borders a large Minnesota Territory. Utah Territory spans from California east to join Nebraska and Kanzas along the Rocky Mountains and the Continental Divide. The very large New Mexico Territory comprises all of today's Arizona and part of Colorado, but no mention is given Arizona. The map details the exploration routes of many expeditions including those of Marcy, Kearny, Fremont, etc., and locates the Santa Fe Trail and the Oregon Trail. It is filled with watershed information, scores of forts, Indian lands, and more.  The Colton decorative border is yet to appear.  From the first edition, second issue of Colton's General Atlas.