1. In 1793, President George Washington laid the cornerstone of the United States Capitol building. This historic event marked the beginning of construction for one of the most iconic buildings in the world. Today, the Capitol serves as the home of the legislative branch of the United States government.

2. On September 18, 1851, the first edition of "The New-York Daily Times" was published. This newspaper would eventually become "The New York Times" and would go on to become one of the most influential newspapers in the world. Today, people still turn to "The Times" for up-to-date news and analysis.

3. In 1947, the Central Intelligence Agency (CIA) was established by President Harry Truman. The CIA is responsible for collecting and analyzing intelligence information that can help protect the United States from national security threats. Today, the CIA is one of the premier intelligence agencies in the world.

4. On September 18, 1964, the United States Congress passed the Civil Rights Act of 1964. This landmark legislation outlawed discrimination based on race, color, religion, sex, or national origin. The Civil Rights Act of 1964 was one of the most important laws in American history and marked a major turning point in the fight for civil rights.

5. In 1975, the first DC United Day was celebrated. This holiday was created to celebrate the unique character and culture of the District of Columbia. Today, DC United Day is still celebrated every year and is a reminder of the rich history and diversity of the nation's capital.