1. On September 14, 1814, British troops set fire to various government buildings, including the White House and the Capitol, during the War of 1812. This event is now known as the Burning of Washington.

2. September 14, 1918, was the opening day of the National Negro Congress, which brought together African American organizations from across the country to discuss issues such as segregation and lynching.

3. In 1959, on September 14, Congress passed the Landrum-Griffin Act, which sought to regulate labor unions and protect workers' rights. The act is named after Senator Philip Landrum of Georgia and Congressman Robert Griffin of Michigan.

4. September 14, 1964, was the day that the United States Supreme Court ruled in Reynolds v. Sims that state legislative districts must be roughly equal in population to ensure equal representation. This decision has had significant implications for redistricting and gerrymandering in the United States.

5. On September 14, 2011, Washington, D.C. became the 17th state to legalize same-sex marriage, following a vote by the D.C. Council earlier in the year. This was a major milestone for LGBTQ+ rights in the United States, and D.C. remains one of the most progressive cities in the country in terms of LGBTQ+ rights.