1. In 1776, the first privateer vessel of the American Revolution, the "Rover," was commissioned by the Continental Congress in Georgetown, DC. Privateer vessels were authorized to attack British ships and seize their cargo, which helped to strengthen America's economy and weaken British forces during the war.

2. On September 9, 1836, President Andrew Jackson issued a proclamation ordering the removal of all Native American tribes from the southeastern United States to Indian Territory west of the Mississippi River. This forced relocation, known as the Trail of Tears, resulted in the deaths of thousands of Native Americans due to disease, starvation, and exposure.

3. The Washington Monument, one of the most famous landmarks in the District of Columbia, was completed on September 9, 1884, after over 25 years of construction. Standing at 555 feet tall, the monument was the tallest structure in the world at the time of its completion.

4. On September 9, 1957, President Dwight D. Eisenhower signed the Civil Rights Act of 1957 into law. This legislation was the first civil rights bill passed by Congress since the Reconstruction era and established the U.S. Commission on Civil Rights to investigate and report on issues related to discrimination on the basis of race, color, religion, sex, or national origin.

5. In 2019, the DC United soccer team opened its new home stadium, Audi Field, on September 9. The stadium, located in the Buzzard Point neighborhood of DC, has a seating capacity of 20,000 and serves as the primary home venue for the DC United soccer club.