Detailed wall map of North America, published by A.H. Dufour.
Arizona is below New Mexico (the Baylor Line), a vestige of the attempt to create a slave and non-slave territory prior to the Civil War. Colorado is named (the map shows Colona in the prior edition).
Nevada and Utah are in early configurations, with the boundary still at 2 degrees to the west and the bottom of Nevada truncated.
Montana is named, with a massive Idaho below, pre-dating Wyoming.
A highly detailed and scarce map.