The State Historical Society of Iowa (SHSI), a division of the Iowa Department of Cultural Affairs, serves as the official historical repository for the State of Iowa and also provides grants, public education, and outreach about Iowa history and archaeology. The SHSI maintains a museum, library, archives, and research center in Des Moines and a research library in Iowa City, as well as several historic sites in Iowa. It was founded in 1857 in Iowa City, where it was first affiliated with the University of Iowa. As the organization grew in size and collections, it became a separate state agency headquartered near the Iowa Capitol in Des Moines.

More information on the Wikipedia page [1]

The website is [2]