1. On August 10, 1790, President George Washington signed the Residence Act, which selected the district between the Potomac and Anacostia Rivers as the site for the new United States capital city.

2. In 1861, on August 10, Washington D.C. saw the arrival of the first federal troops sent to protect the U.S. Capitol and other government buildings during the Civil War.

3. August 10, 1978 marked the opening of the National Air and Space Museum in Washington D.C. The museum has become one of the most visited in the world, housing some of the most important artifacts in aviation and space exploration history.

4. On August 10, 1990, a record-breaking heatwave struck Washington D.C. Temperatures soared to 106 degrees Fahrenheit and resulted in several heat-related fatalities and injuries.

5. August 10, 2015 saw the signing of the D.C. Universal Paid Leave Amendment Act by Mayor Muriel Bowser. This bill provides up to 8 weeks of paid leave to D.C. workers to care for a sick or newborn child or a sick family member.