Fort Garland museum brings to light dark history of Native enslavement in Southern Colorado "Unsilenced: Indigenous Enslavement in Southern Colorado" now on display History Colorado. and last updated 2021-07-03 00:44:04-04 DENVER -- In southern Colorado, near the border with New Mexico, sit two counties: Costilla and Conejos, with a history rarely talked about but which was recently revealed through the discovery of census forms. The forms are dated 1865, when Colorado was a U.S. territory, long before becoming a state in 1876. This was also after the Civil War and after the Emancipation Proc...