Describes the historic features to be seen at Fort Union and exposes a cross section of the entire sweep of 19th century history in the Southwest. As a base of operations for both military and civilian ventures in New Mexico for 40 years, 1851 to 1891, Fort Union played a key role in shaping the destiny of the Southwest. Also includes appendix 1: Commanding Officers of Fort Union, 1859-61; Appendix 2: Regiments whose components were assigned to Fort Union.