1. On April 27, 1865, John Surratt was arrested in Washington, D.C. for his involvement in the assassination of President Abraham Lincoln. Surratt was a co-conspirator with John Wilkes Booth and had helped plan the assassination. After his arrest, Surratt was extradited to Maryland to stand trial, but he was eventually released due to a hung jury.

2. On April 27, 1949, the Supreme Court of the United States upheld the constitutionality of the Taft-Hartley Act, which had been passed by Congress over President Harry Truman's veto in 1947. The act limited the power of labor unions and allowed states to pass "right-to-work" laws, which prohibited mandatory union membership as a condition of employment.

3. The Washington Nationals baseball team played their first game at Nationals Park on April 27, 2008. The team had previously played their home games at RFK Stadium, but the new stadium, which was located in the Navy Yard neighborhood of Washington, D.C., was specifically designed for baseball and provided a better fan experience.

4. On April 27, 2011, President Barack Obama released his long-form birth certificate in response to continued claims by some political opponents that he was not born in the United States and was therefore not eligible to be president. The release of the birth certificate put the issue to rest, but it also highlighted the persistence of "birtherism" and the willingness of some to challenge the legitimacy of a sitting president.

5. The National Museum of African American History and Culture opened on the National Mall in Washington, D.C. on April 27, 2017. The museum, which was established by an act of Congress in 2003, showcases the history and culture of African Americans in the United States and includes exhibits on slavery, the Civil Rights Movement, sports, music, and many other topics. The museum has become a major tourist attraction and a symbol of the ongoing struggle for racial justice in America.