Equal under the Sky is the first historical study of Georgia O'Keeffe's complex involvement with, and influence on, US feminism from the 1910s to the 1970s. Utilizing understudied sources such as fan letters, archives of women's organizations, transcripts of women's radio shows, and programs from women's colleges, Linda M. Grasso shows how and why feminism and O'Keeffe are inextricably connected in popular culture and scholarship. The women's movements that impacted the creation and reception of O'Keeffe's art, Grasso argues, explain why she is a national icon who is valued for more than her artistic practice.