1. In 1865, Robert E. Lee surrendered to Ulysses S. Grant at Appomattox Court House, effectively ending the Civil War. While this event did not take place in the District of Columbia, it had a significant impact on the city as it marked the beginning of the end of the war and the eventual abolition of slavery.

2. The first cherry blossom trees were planted in the District of Columbia on April 9, 1912. These trees, which were a gift from the mayor of Tokyo, were planted along the Tidal Basin and have since become a beloved symbol of springtime in the city.

3. On April 9, 1968, following the assassination of Martin Luther King Jr., riots broke out in the District of Columbia. The riots lasted for several days and resulted in extensive damage to the city, including more than 1,000 buildings being burned or destroyed.

4. In 1990, the District of Columbia became the first jurisdiction in the United States to legalize medical marijuana. The law, which was passed by a voter initiative, allowed patients with certain conditions to use marijuana for medicinal purposes.

5. On April 9, 2005, the World Bank and International Monetary Fund held their annual spring meetings in the District of Columbia. The meetings, which were accompanied by protests and demonstrations, focused on topics such as poverty reduction, debt relief, and economic development.