Folk singer Pete Seeger performs at the opening of the Washington, D.C., labor canteen in 1944, sponsored by the Congress of Industrial Organizations (CIO). Wartime migration brought people from across the country to centers of industry and military operations. Migration opened new possibilities for urban communities. African American neighborhoods grew dramatically; urban populations grew younger and more mobile; and gay and lesbian communities began to flourish and become more visible. The Granger Collection, New York.