From the record
“Chahta Tamaha served as the capital of the Choctaw Nation from 1863 to 1883 in Indian Territory. The town developed initially around the Armstrong Academy, which was operated by Protestant religious missionaries from 1844 to 1861 to serve Choctaw boys.”
Wikipedia article Chahta Tamaha, Indian Territory, CC BY-SA 4.0.
One of 17 National Register listings published here for Bryan County · listed in 1972 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service · the Wikipedia article