Discover the new retrospective exhibit that debuted for the Oklahoma History Center’s (OHC) 20th anniversary celebration: Collect. Preserve. Share. 20 Years at the Oklahoma History Center. The OHC first opened to the public in 2005 and significantly enhanced the Oklahoma Historical Society’s (OHS) ability to collect, preserve, and share the state’s history. The exhibit showcases significant acquisitions of clothing, artifacts, documents, and photographs from the past twenty years, highlighting the museum’s expanded capacity, mission, and the overall impact of the institution.