Key milestones in stereoscopic history took place in and around Chicago and the Midwest including: 

• The Tru-Vue plant operated in Rock Island, IL from 1932 to 1951 (wikipedia link)

• The Stereo Realist Camera was produced by the David White Co in  Milwaukee, WI from 1947 to 1971 (wikipedia link) 

• The Chicago Stereo Camera Club has been based in Chicago from 1952 to the Present (webpage link)