1. Emancipation Day: June 19th is known as Juneteenth, a commemoration of the end of slavery in the United States. In the District of Columbia, June 19th is also recognized as Emancipation Day, which celebrates the DC Compensated Emancipation Act of 1862, which freed nearly 3,000 slaves in the nation's capital.

2. The Women's Army Corps was established: On June 19, 1942, the Women's Army Corps was established as a noncombatant branch of the US Army, enabling women to serve in various roles including clerks, cooks, and mechanics. The first WAC training center was located in Fort Des Moines, Iowa.

3. Founding of Gallaudet University: On June 19, 1864, Gallaudet University was founded in Washington, DC as the first and only university in the world for deaf and hard of hearing students. Today, the university remains a global leader in higher education for the deaf and hard of hearing.

4. The Lincoln Memorial was dedicated: On June 19, 1922, the Lincoln Memorial was officially dedicated in Washington, DC. The ceremony was attended by President Warren G. Harding and other prominent political and civic leaders. The memorial serves as a symbol of Abraham Lincoln's legacy and the fight for freedom and equality.

5. The Battle of Monocacy took place: On June 19, 1864, the Battle of Monocacy took place near Frederick, Maryland during the Civil War. Union forces, led by Major General Lew Wallace, attempted to delay Confederate troops under General Jubal Early from attacking Washington, DC. Although the Union was ultimately defeated, their efforts allowed for additional reinforcements to arrive and protect the capital.