The Mildred Lane Kemper Art Museum at Washington University in St. Louis will present “Design Agendas: Modern Architecture in St. Louis, 1930s–1970s” beginning Sept. 13. With nearly 300 architectural drawings, models, photographs, films, digital maps and artworks, “Design Agendas” is the first major exhibition to examine how interlocking civic, cultural and racial histories, as well as conflicting ideological aims, reshaped the city.