July 22 is remembered in District of Columbia history for several interesting events that have taken place over the years. Here are five fascinating facts about this date:

1. In 1933, the last lynching in the District of Columbia took place on July 22. A man named George Armwood was accused of assaulting a white woman and was taken from his jail cell by a mob of people who lynched him in Princess Anne, Maryland. This incident led to the introduction of anti-lynching legislation in Congress.

2. The first U.S. patent was issued on July 22, 1790, to Samuel Hopkins for an improved method of making potash, a fertilizer ingredient.

3. On July 22, 1861, the First Battle of Manassas, also known as the First Battle of Bull Run, was fought in Virginia during the American Civil War. It was the first major battle of the war and resulted in a Confederate victory.

4. The Daughters of the American Revolution (DAR) dedicated the Constitution Hall on July 22, 1929. The building serves as the flagship meeting place of the DAR, an organization devoted to promoting American heritage and patriotism.

5. NASA's Space Shuttle program achieved a historic milestone on July 22, 1991. Space Shuttle Atlantis completed its ninth mission, placing the Compton Gamma Ray Observatory into orbit. This was the first Gamma Ray Observatory to be placed in space and opened up a new era in space-based astronomy.

In conclusion, July 22 has seen a range of significant events in District of Columbia history, from inventions and dedications to violence and warfare. These events have left a lasting impact on the region and continue to be remembered today.