1863 Indian Wars: Chief Pocatello of the Shoshone tribe signs the Treaty of Box Elder, agreeing to stop the harassment of emigrant trails in southern Idaho and northern Utah.
1890 Idaho is admitted as the 43rd U.S. state.
1976 Collapse of the Teton Dam in Idaho, United States.
1992 Ruby Ridge Standoff in Idaho
1992 FBI HRT sniper Lon Horiuchi shoots and kills Vicki Weaver during an 11-day siege at her home at Ruby Ridge, Idaho.