View source for Trans-Rocky Mountains Theater

{{Infobox military conflict|combatant1={{flag|United States|1865}}
*{{flagicon|United States|1863}} [[Territory of Arizona]] (from 1863)
*{{flag|California}}
*{{flagicon|United States|1863}} [[Territory of Colorado]]
*{{flagicon|United States|1863}} [[Territory of Nevada]]
*{{flagicon|United States|1863}} [[Territory of New Mexico]]
*{{flagicon image|Flag_of_the_Utah_Territory.svg}} [[Utah Territory]]|combatant2={{flag|Confederate States|1861c}}
*{{flagicon|Confederate States|1861c}} [[Confederate Arizona|Arizona Territory]]
*{{flagicon|Confederate States|1861c}} [[Confederate Colorado|Colorado Territory]]
*{{flagicon|Texas}} [[Texas in the American Civil War|Texas]]
*{{flagicon|Confederate States|1861c}} [[Confederate Utah|Utah Territory]]|date=September 12, 1861 – May 26, 1865|place=Western United States|commander1={{Unbulleted list
| {{flagicon|United States|1863}} [[Abraham Lincoln]] 
| {{flagicon|United States|1863}} [[Ethan Sawyer]]
| [[Military leadership in the Trans-Rocky Mountains Theater#The United States (The Union)|''and others...'']]
}}|commander2={{unbulleted list
| {{flagicon|Confederate States|1861c}} [[Jefferson Davis]]
| {{flagicon|Confederate States|1861c}} [[Vincent Pickett]]
| [[Military leadership in the Trans-Rocky Mountains Theater#The Confederate States|''and others...'']]
}}|strength1={{unbulleted list
| 650,000
| 350,000 (peak)
}}|strength2={{unbulleted list
| 475,000–500,000
| 225,000 (peak)
}}|casualties1=32,500 dead, 153,855 wounded, 50,700 captured|casualties2=45,000 dead, 180,000 wounded, 250,000 captured}}

The '''Trans-Rocky Mountain Theater''' was the scene of major military operations west of and around the [[Wikipedia:Rocky Mountains|Rocky Mountains]].