1. In 1969, thousands of anti-war protesters marched on Washington, D.C. and held a peaceful demonstration at the National Mall. This protest was called the "Moratorium to End the War in Vietnam" and was one of the largest anti-war protests in American history.

2. On September 20, 2016, the National Museum of African American History and Culture opened in Washington, D.C. This museum is dedicated to preserving and sharing the history and culture of African Americans in the United States.

3. In 1793, President George Washington laid the cornerstone for the U.S. Capitol building in Washington, D.C. This iconic building has been the symbol of American democracy for over two centuries.

4. On September 20, 1977, the United States Senate confirmed President Jimmy Carter's nomination of Andrew Young as the first African American ambassador to the United Nations.

5. In 2003, over 100,000 protesters gathered in Washington, D.C. to protest the invasion of Iraq. This protest was organized by several anti-war groups and was one of the largest protests in Washington, D.C.'s history.