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Mandan Treaty Signing
- When
- 1825
- Where
- unknown
In 1825, the Mandans signed a peace treaty with the leaders of the Atkinson-O'Fallon Expedition, establishing terms for U.S. supremacy and trade control.
The treaty required the Mandans to recognize U.S. supremacy, acknowledge residence on U.S. territory, and relinquish trade control to the United States. The supplied passages do not confirm the specific date or location of Senate ratification.
Sources
- Mandan Wikipedia, revision of 2026-09-28
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.