Fort Union Trading Post National Historic Site
- Address: 143rd Ave NW (Hwy 327)
- Vicinity: W of Buford, at the Montana-North Dakota state line
- US County of Roosevelt County in Montana
- US County of Williams County in North Dakota
The Grandest Fort on the Upper Missouri River
Between 1828 and 1867, Fort Union was the most important fur trade post on the Upper Missouri River. Here, the Assiniboine and six other Northern Plains Indian Tribes exchanged buffalo robes and smaller furs for goods from around the world, including cloth, guns, blankets and beads. A bastion of peaceful coexistence, the post annually traded over 25000 buffalo robes and $100000 in merchandise. - NPS