1. In 1923, the Washington Senators won the American League pennant for the first time in their history. The team, led by player-manager Bucky Harris, went on to face the New York Giants in the World Series, where they ultimately lost in six games.

2. In 1956, the Supreme Court of the United States ruled in Browder v. Gayle that segregation on public transportation was unconstitutional. The case, which originated in Montgomery, Alabama, challenged the city's practice of forcing African American passengers to sit at the back of buses.

3. In 1962, the first meeting of the National Advisory Committee for Aeronautics (NACA) was held at its new headquarters in Washington, DC. The organization, which later became NASA, was established to advance the nation's aeronautical research and development.

4. In 2004, the National Museum of the American Indian opened its doors in Washington, DC. The museum, which is part of the Smithsonian Institution, is dedicated to the preservation and celebration of the diverse cultures of Native peoples throughout the western hemisphere.

5. In 2016, the National Museum of African American History and Culture opened on the National Mall in Washington, DC. The museum documents the contributions and experiences of African Americans throughout US history, from slavery to the present day.