EVENTS:
- 332 – Constantine the Great announced free distributions of food to the citizens in Constantinople.
- 1848 – Opening of the first German National Assembly (Nationalversammlung) in Frankfurt, Germany.
- 1860 – Abraham Lincoln wins the Republican Party presidential nomination over William H. Seward, who later becomes the United States Secretary of State.
- 1912 – The first Indian film, Shree Pundalik by Dadasaheb Torne is released in Mumbai.
- 1927 – After being founded for 20 years, the Government of the Republic of China approves Tongji University to be among the first national universities of the Republic of China.
- 1969 – Apollo program: Apollo 10 is launched.
- 1974 – Nuclear test: under project Smiling Buddha, India successfully detonates its first nuclear weapon becoming the sixth nation to do so.
- 1980 – 1980 eruption of Mount St. Helens: Mount St. Helens erupts in Washington, United States, killing 57 people and causing $3 billion in damage.
- 2005 – A second photo from the Hubble Space Telescope confirms that Pluto has two additional moons: Nix and Hydra.
- 2011 – 22 people are killed when Sol Líneas Aéreas Flight 5428 crashes in southern Argentina.
- 2015 – At least 78 people die in a landslides caused by heavy rains in the Colombian town of Salgar.
- 2018 – A school shooting at Santa Fe High School in Texas kills 10 people. aeroplane crashes in Havana’s José Martí International Airport.
- 2019 – United States presidential election: Joe Biden announces his presidential campaign.
BIRTHS:
- 1872 – Bertrand Russell, 3rd Earl Russell, English mathematician, historian, and philosopher, Nobel Prize laureate (d. 1970)
- 1901 – Vincent du Vigneaud, American chemist, Nobel Prize laureate (d. 1978)
- 1905 – Hedley Verity, English cricketer (d. 1943)
- 1933 – H. D. Deve Gowda, Indian politician, 11th Prime Minister of India
- 1947 – Hugh Keays-Byrne, Indian-Australian actor
- 1967 – Nancy Juvonen, American screenwriter and producer, co-founded Flower Films
- 1977 – Lee Hendrie, English footballer
- 1982 – Jason Brown, English footballer
- 1983 – Gary O’Neil, English footballer
- 2000 – Ryan Sessegnon, English footballer
- 2001 – Emma Navarro, American tennis player
- 2003 – Travis Hunter, American football player
HOLIDAYS and OBSERVANCES:
- Flag and Universities Day (Haiti)
- Independence Day (Somaliland (unrecognized))
- International Museum Day (International)
- World AIDS Vaccine Day (International)
- Baltic Fleet Day (Russia)
