Establishment of Fort Buchanan on the Sonoita River
- When
- 1856
- Where
- Sonoita River, New Mexico Territory
- Episodes
- 1
The United States Army established Fort Buchanan on the Sonoita River on 17 November 1856 to control lands acquired through the Gadsden Purchase. Although the site lies in present-day Arizona, it was within New Mexico Territory at the time; Arizona Territory was not organized until 1863. The Army had held the purchase lands since 1854, but troops were not stationed there until 1856.
Episodes
Background and detail
Establishment. Fort Buchanan was founded on November 17, 1856, on the Sonoita River, three miles southwest of present-day Sonoita. It was situated on the east slope of Hog Canyon. The post was established to help control the new land acquired in the Gadsden Purchase, serving as a military presence in the troubled region.
Territorial Context. The Compromise of 1850 created the New Mexico Territory. In 1863, the Union created its own Arizona Territory out of the western half of the New Mexico Territory using a north-to-south dividing line. It therefore follows that in 1856 the fort site lay within New Mexico Territory, making references to an Arizona location for the establishment anachronistic, though this attribution is an inference from the 1863 division rather than a directly sourced statement.
People involved
- United States Army · Establishing authority
Sources
- Gadsden Purchase Wikipedia
- Fort Buchanan, Arizona Wikipedia, revision of 2026-07-19
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.