1. 1868 – The impeachment trial of U.S. President Andrew Johnson ends with his acquittal by one vote.

2. 1896 – The Dow Jones Industrial Average is first published, with an initial list of twelve stocks.

3. 1940 – The Dunkirk evacuation begins as Allied troops start to evacuate from Dunkirk, France, during World War II.

4. 1966 – British Guiana gains independence from the United Kingdom, becoming Guyana.

5. 1969 – The Apollo 10 astronauts return to Earth after a successful lunar mission, paving the way for Apollo 11’s moon landing.

6. 1972 – The United States and the Soviet Union sign the Anti-Ballistic Missile Treaty.

7. 1998 – The Supreme Court of the United States rules in New Jersey v. T.L.O. that school officials do not need a warrant or probable cause to search students.

8. 2004 – The United States Army veteran Terry Nichols is found guilty of 161 state murder charges for helping carry out the Oklahoma City bombing.

9. 2011 – A mass tornado outbreak devastates Joplin, Missouri, causing significant casualties and damage.

10. 2019 – The European Union elections are held, resulting in significant gains for green and liberal parties across Europe.