Reference sources are great for finding an overview of a topic and related material.
Politics - WWI, postwar, social movements
Economy - the Great Depression, income
WPA Federal Works Project Administration
Exposition internationale des arts décoratif et Industriels Modernes 1925
Working conditions - leisure time
Inventions and availability of materials - zippers and choice of fabric
Morals - changing norms, prohibition
Mass media - rise of the motion picture, advertisment
Films - films 1930s
Art and architecture - Art Deco, Bauhaus
Art & Literary -Harlem Renaissance, Futurism
Music - Jazz
Sports - baseball