John D'Emilio is an Assistant Professor of American History at the University of North Carolina. His latest book, "Sexual Politics, Sexual Communities," is an historical analysis of the creation of gay activism from 1940-1970. The book looks at how World War II helped create a gay community, the politics and organizing styles of early homophile groups, such as the Mattachine Society and the Daughters of Bilitis, and the impact of the civil rights movement, student activism, and feminism on gays. D'Emilio joins the show to discuss his research and conclusions.