1. In 1792, the cornerstone of the White House was laid by President George Washington. The iconic building has stood as the official residence of the President of the United States for over 200 years.

2. In 1845, American journalist and abolitionist Frederick Douglass escaped from slavery in Maryland and made his way to freedom in New York. He went on to become a prominent voice in the fight against slavery and for civil rights, publishing numerous autobiographies and giving passionate speeches throughout the country.

3. In 1917, the first troops of the 91st Division departed from Washington state for World War I. The Division was made up of soldiers from across the western United States and was notable for its diversity, with a large number of African American and Hispanic troops serving alongside their white counterparts.

4. In 1972, U.S. Senator Henry M. "Scoop" Jackson of Washington state announced his candidacy for the Democratic nomination for President of the United States. Jackson was a prominent liberal voice in Congress, known for his advocacy on issues like environmental protection, civil rights, and human rights.

5. In 2010, the Washington Nationals played their first-ever postseason game, facing off against the San Francisco Giants in Game 1 of the National League Division Series. Although the Nationals ultimately lost the series, the team's first foray into the playoffs marked a significant moment for the franchise and its fans.