In this dissertation, I examine the Sonoran Desert trilogy by Kathleen Alcalá through the lens of post-oppositional theory as developed by AnaLouise Keating. Moving beyond the use of post-oppositional theory to analyze non-fiction works, I apply this theory instead to the fiction of Kathleen Alcalá—whose work appears in such anthologies as The Norton Anthology of Latino Literature. Alcalá, though well published, is underrepresented in contemporary literary criticism, as can be seen by the only eight entries under her name in the MLA International Bibliography. Therefore, I have chosen her most significant fiction work, her trilogy about the Sonoran Desert, as the perfect text upon which to map post-oppositional theory. Through analysis of her three novels, I show that her work is an ideal example of post-oppositionality in action and that her characters act as post-oppositional revolutionaries and prophets within the pages of the text. The first chapter outlines the parameters of the project. In Chapter 2, I argue that post-oppositionality can be seen in Alcalá through gender bending, looking at the characters of Membrillo and Manzana, Corey, and Rosalinda. In Chapter 3, I argue that the characters of Estela, La Señorita, and Magdalena are enacting post-oppositionality through their transcendence of traditional women's roles in sexuality. In Chapter 4, I argue that the female characters of the novels act as revolutionaries through their political and social agency—reaching out to other characters through such work as educating and writing. In Chapters 5 and 6, I feature my interviews with Alcalá and Keating, who were generous enough to speak with me over Zoom during lockdown. Finally, in the conclusion chapter, Chapter 7, I examine how post-oppositionality in the novels prepares the reader for post-oppositional action in reality. Throughout all of these chapters, I rely on other theories and historiographies such as gender theory (Judith Butler, Foucault, West and Zimmerman, etc.), the history of women's sexuality, and the roles of women in nineteenth century Mexico (looking especially at the works of Nancy LaGreca and Anna Macías).