Mid-twentieth-century student activism is a pivotal chapter in American history. While college activism has been well documented, the equally vital contributions of high school students have often been overlooked. Only recently have scholars begun to recognize the transformative role teenagers played in reshaping American education. High School Students Unite! highlights the crucial impact of high school activists in the 1960s and 1970s. Inspired by civil rights and antiwar movements, students across the nation demanded a voice in their education by organizing sit-ins, walkouts, and strikes. From cities such as San Francisco and Chicago to smaller towns such as Jonesboro, Georgia, these young leaders fought for curricula that reflected their evolving worldviews. Drawing on archival research and interviews, Aaron G. Fountain Jr. reveals how teenagers became powerful agents of change, advocating for constitutional rights and influencing school reform. Ironically, the modernization of school security, including police presence, was partly a response to these student-led movements. Through oral histories and FBI records, this fascinating history offers a fresh perspective on high school activism and its lasting impact on American education.