1. In 1775, the Continental Congress created the United States Postal Service. Benjamin Franklin was appointed as the first Postmaster General.

2. In 1865, the first streetcar system in Washington, D.C., began operating. It was powered by horse-drawn cars.

3. In 1925, a high temperature of 106°F was recorded in the District of Columbia, which remains the hottest temperature ever recorded in the city.

4. In 1953, the Interstate Commerce Commission authorized the construction of the Capital Beltway around D.C. to improve traffic flow.

5. In 1990, Americans with Disabilities Act (ADA) was signed into law by President George H. W. Bush in a ceremony at the White House. It was designed to provide equal protection and access to all Americans with disabilities.