1) In 1830, the first edition of the "National Intelligencer" newspaper was published in the District of Columbia. This paper would go on to be an influential voice in national politics for several decades.

2) On April 6, 1862, the Confederate Army launched a surprise attack on Union forces in the Battle of Shiloh. Although the battle took place in Tennessee, many soldiers from the District of Columbia fought on both sides.

3) In 1909, a riot erupted in the District of Columbia after black boxer Jack Johnson defeated white boxer James J. Jeffries in a highly-publicized match. The riot lasted for several days and resulted in numerous injuries and arrests.

4) On April 6, 1930, the Smithsonian American Art Museum opened its doors to the public for the first time. The museum's collection includes over 40,000 works of art, including paintings, sculptures, and photographs.

5) In 2009, the WHO Global Forum on Medical Devices was held in the District of Columbia. The forum brought together experts from around the world to discuss how medical technology can be used to improve global health outcomes.