1. The District of Columbia was created on June 30th, 1790, by the signing of the Residence Act by President George Washington. The act established a federal district to serve as the nation's capital, with land donated by Maryland and Virginia.

2. The famous African American Abolitionist and writer, Frederick Douglass delivered a powerful speech on June 30th, 1876, in celebration of the 100th anniversary of the signing of the Declaration of Independence. The speech, titled "The Nation's Hour," was delivered at the unveiling of the Emancipation Statue in Lincoln Park.

3. On June 30th, 1960, the District of Columbia Public Schools instituted a controversial integration policy, which mandated that all public schools in the district be integrated by September of the same year. The policy was met with resistance and protests from some white parents, but it effectively desegregated the public school system.

4. June 30th, 1994, marked a significant moment in the district's history, as Washington National Airport was renamed Ronald Reagan National Airport. The name change was met with controversy, as many residents of the district were opposed to honoring a former president who had opposed civil rights legislation and was involved in the Iran-Contra scandal.

5. On June 30th, 2004, the World War II Memorial was dedicated on the National Mall. The memorial honors the 16 million men and women who served in the armed forces during World War II, including over 400,000 who lost their lives. The dedication was attended by thousands of veterans and their families, as well as dignitaries and members of the public.