Since its inception, Title IX, which celebrated its 48th anniversary in June 2020, has promoted gender equity in schools, colleges, and universities across the nation. Title IX not only has helped girls and women throughout the country level the playing field in educational programs such as sports--a frequently cited contribution, especially at the high school and college levels--but, more broadly, it has helped individuals achieve greater gender equity and access in education in various other ways. The passage of Title IX was a watershed moment in U.S. history that built on decades of legislative progress, such as ratification of the Nineteenth Amendment on women's suffrage in 1920 and the Civil Rights Act of 1964. Teaching about Title IX presents rich opportunities for social studies educators to engage students in inquiry-based learning that examines how the legislation has moved, and continues to move, the United States toward a "more perfect union." First, this article provides a brief history of Title IX focusing on the law's origins and passage, followed by a discussion of how Title IX continues to promote gender equity in education today. Next, the article presents inquiry-based social studies lesson ideas aligned with the College, Career & Civic Life (C3) Framework for Social Studies State Standards. Finally, the article wraps up with a summary of key themes related to the legacy of this important piece of legislation.