23 June 1899

Citizens of the United Kingdom voted in favour of leaving the European Union.

Croatian War of Independence: The Battle of the Miljevci Plateau ended after a failed counterattack by forces of the Republic of Serbian Krajina against the Croatian Army who had captured the plateau.

The first instalment of the video-game series Sonic the Hedgehog was released in North America.

Chinese American Vincent Chin died after being beaten into a coma in Highland Park, Michigan, U.S., by two automotive workers who were angry about the success of Japanese auto companies.

The Los Angeles Dodgers started Steve Garvey, Davey Lopes, Ron Cey, and Bill Russell in the infield, beginning a record eight-year run in Major League Baseball for four people designated as starters for those positions.

President Richard Nixon signed Title IX (co-author Patsy Mink pictured) into law as part of the Education Amendments, prohibiting gender discrimination in any educational program receiving U.S. federal funds.

In a nationwide referendum, Gamal Abdel Nasser (pictured) was elected President of Egypt, a post he held until his death in 1970.

The Holocaust: After a closely supervised visit to Theresienstadt Ghetto in German-occupied Czechoslovakia, Red Cross official Maurice Rossel reported that conditions there were "almost normal".

The College Board administered the first Scholastic Aptitude Test, a major standardized test for university and college admissions in the United States.

The Parliament of Canada passed the Rocky Mountains Park Act, creating Banff National Park in Alberta as the country's first national park.

Stand Watie became the last Confederate general of the American Civil War to surrender to Union forces.

War of the First Coalition: Napoleon signed the Armistice of Bologna, agreeing a ceasefire between France and the Papal States.

Anglo-Spanish War: During the Action of Faial, an English attempt to capture a Portuguese carrack, reputedly one of the richest ever to set sail from the Indies, caused it to explode with all the treasure lost.

Reconquista: Troops of the Emirate of Granada defeated those of the Kingdom of Castile and the Kingdom of León in the Battle of Moclín.

War of Saint Sabas: In an action off Trapani, Sicily, a Venetian fleet captured all 27 opposing Genoese vessels.

Twelve boys and an assistant coach from a soccer team in Thailand are trapped in a flooding cave, leading to an 18-day rescue operation.

Brexit: The United Kingdom votes in a referendum to leave the European Union, by 52% to 48%.

The last of Syria's declared chemical weapons are shipped out for destruction.

Nik Wallenda becomes the first man to successfully walk across the Grand Canyon on a tight rope.

Militants storm a high-altitude mountaineering base camp near Nanga Parbat in Gilgit–Baltistan, Pakistan, killing ten climbers and a local guide.

Ashton Eaton breaks the decathlon world record at the United States Olympic Trials.

American social news and discussion site Reddit is founded in Medford, Massachusetts by Steve Huffman and Alexis Ohanian.

The 8.4 Mw southern Peru earthquake shakes coastal Peru with a maximum Mercalli intensity of VIII (Severe). A destructive tsunami followed, leaving at least 74 people dead, and 2,687 injured.

NASA's Space Station Processing Facility, a new state-of-the-art manufacturing building for the International Space Station, officially opens at Kennedy Space Center.