"Iron and Steel in America" Exhibit, United States National Museum, by Unknown, 1950s, Smithsonian Archives - History Div, The "Iron and Steel in America" exhibition prepared as part of the Smithsonian's Exhibits Modernization Program in the 1950s. The exhibit was located in the United States National Museum (USNM), now the Arts and Industries (A&I) Building. Visitors are looking at gigantic chain links while others are looking at exhibit cases..