Idaho in the American Civil War Idaho in the American Civil War The history of Idaho in the American Civil War is atypical, as the territory was far from the battlefields. At the start of the Civil War, modern-day Idaho was part of the Washington Territory. On March 3, 1863, the Idaho Territory was formed, consisting of the entirety of modern-day Idaho, Montana, and all but southwest Wyoming. However, there were concerns about Confederate sympathizers in the eastern half of the territory, in what is present-day Montana. As a result, in 1863 Sidney Edgerton traveled quickly to see President Abraham Lincoln about the situation; this was
Conclusion of the American Civil War May 10, U.S. President Andrew Johnson declared the rebellion's armed resistance virtually ended . Thompson's Brigade surrendered on May 11, Confederate forces of North Georgia surrendered on May 12, and Kirby Smith surrendered on May 26 (officially signed June 2). The last battle of the American Civil War was the Battle of Palmito Ranch in Texas on May 12 and 13. The last significant Confederate active force to surrender was the Confederate allied Cherokee Brigadier General Stand Watie and his Indian soldiers on June 23. The last Confederate surrender occurred on November 6, 1865, when the Confederate warship CSS "Shenandoah"