Britannica Sources used in this answer

Why did the United States abandon its Bozeman Trail posts in 1868?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Plains Wars View of the army camp at Hidden Wood Creek during Lieut. Col. George Armstrong Custer's Black Hills expedition, 1874; photograph by W.H. Illingworth.

The United States abandoned its Bozeman Trail posts in 1868 primarily because the route had become the site of a costly and difficult conflict known as Red Cloud’s War.12

Beginning in 1865, a coalition of Lakota, Northern Cheyenne, and Arapaho forces, led by the Oglala chief Red Cloud, relentlessly harassed military construction crews and travelers to protect their hunting grounds. The conflict intensified following the Fetterman Massacre in December 1866, where an entire detachment of 80 U.S. soldiers was killed after being drawn into an ambush.132

Recognizing that the region was proving too expensive and difficult to develop, the U.S. government included the abandonment of these posts as part of a broader peace initiative in the Second Treaty of Fort Laramie in 1868. Under the terms of this agreement, the military withdrew its garrisons, burned the forts, and ceased efforts to maintain the road.123