Dr. Martin Luther King Jr. was only 39 years old when his life was tragically ended, yet in less than four decades, he transformed the moral and legal landscape of America. Through courage, faith, and nonviolent resistance, Dr. King led a movement that challenged injustice and expanded freedom for millions. Before his assassination on April 4, 1968, his leadership produced historic achievements that continue to shape the nation today. 1. Leadership of the Montgomery Bus Boyco