I've stumbled up this image in the National Archives describing the 1868 treaty between the Navajo and United States, which was signed when the Navajo were released from Bosque Redondo. https://catalog.archives.gov/id/290020246 and another here: https://catalog.archives.gov/id/290020249?objectPage=2
Higher resoultion images available at the linked sites
What is confusing is, though it says in the title 1868, the metadata on the page says "Produced: January 24, 1955". There is also a yellow index card along with it that also lists 1955.
How can I determine if this is a photograph of actual signing, or if it is just a re-endactment of the event photographed in 1955? My only clue from within the photograph is the table with the folding legs, which seem like tables told today used for temporary events, and which I'd be surprised such a design is more than 150 years old.