Historical anniversaries mark significant events that occurred on the same date in previous years. These occasions can celebrate a wide range of happenings, such as the signing of important treaties, the birth or death of influential figures, or major social movements. For example, the Declaration of Independence was adopted on July 4, 1776, and is celebrated annually in the United States. Commemorating these anniversaries helps people remember and reflect on their history. They often involve ceremonies, educational programs, and public discussions. Events like the fall of the Berlin Wall on November 9, 1989, serve as reminders of the struggles and triumphs that have shaped societies around the world.