What is the background in the winter campaign in 1868 in the American west?

The winter campaign of 1868 in the American West was part of the larger Indian Wars, primarily involving conflicts between the U.S. military and various Native American tribes, particularly the Cheyenne and Sioux. Following the Treaty of Fort Laramie in 1868, which aimed to establish peace and guaranteed Native territories, tensions escalated due to encroachments by settlers and miners. The U.S. Army launched winter campaigns, including the infamous "Winter Campaign of 1868-1869," to subdue the tribes and enforce federal authority, resulting in significant violence and disruption of Native life. This campaign underscored the broader struggle for land and sovereignty during a time of rapid expansion and conflict in the American West.