Through the mural The Great Wall of Los Angeles (1974-2024), Chicana artist Judith F. (“Judy”) Baca has transformed public space art into an expansive public space mural, whose historiography centers and reclaims the contributions of marginalized communities within the historical narratives of California. Baca acts as an avatar for generations of unacknowledged Latinos who developed the United States’ economy, politics, and culture despite being denied labor rights and experiencing discrimination and racial violence, and responded with activism. The Great Wall depicts Mexican workers in the citrus industry and as part of the Bracero program that built California’s economy from the early 1900s to the 1960s; the injustices of mass repatriation and the displacement of Latino communities in the 1940s to the 1970s; the violence directed, on the basis of racial prejudices, against Latino men in the Zoot Suit Riots in 1943; and the force of Latino labor activism in the 1900s. Not only does Baca visualize change, but she also actualizes it by transforming the dynamics of her artistic mediums and process. Although it is not unusual for muralists to employ trained artists as assistants, Baca broke with convention by mobilizing over 400 teens to contribute to The Great Wall; furthermore, she chose to paint these murals in spaces rejected by Los Angeles rather than “desirable” locations. This research illuminates how Baca’s work serves as a powerful historical record and a model for community-driven social change, offering a critical re-evaluation of public art’s role in shaping historical consciousness and fostering equity.