History has been shaped not only by great leaders and major battles, but also by deadly plots that changed the world in an instant. In this video, we are counting down 20 assassination attempts that left a lasting mark on history. From failed attacks that changed security forever to deadly plots that triggered political chaos, wars, reforms, and global consequences, these moments show how one act can alter the course of nations. Some targets survived and became stronger, while others became symbols of a turning point in history. We will explore who was involved, what happened, and why each attempt still matters today. These stories are dramatic, shocking, and often more complicated than they first appear. Whether you are fascinated by history, politics, or real-life conspiracies, this countdown is packed with unforgettable events. Watch until the end and tell us which assassination attempt changed history the most.