Yemenia Flight 626 crashes off the coast of Moroni, Comoros killing 152 people and leaving 1 survivor

The United Kingdom transfers sovereignty over Hong Kong to the People's Republic of China.

Former Prime Minister Margaret Thatcher joins the House of Lords as Baroness Thatcher.

32 miners are killed when a coal mine catches fire in the Donbass region of Ukraine releases toxic gas.

East Germany and West Germany merge their economies.

The Royal Canadian Mint introduces the $1 coin, known as the Loonie.

The U.S. Supreme Court rules in Bowers v. Hardwick that states can outlaw homosexual acts between consenting adults.

Thirty-nine American hostages from the hijacked TWA Flight 847 are freed in Beirut after being held for 17 days.

The first leap second is added to the UTC time system.

The crew of the Soviet ''Soyuz 11'' spacecraft are killed when their air supply escapes through a faulty valve.

Ohio ratifies the 26th Amendment to the U.S. Constitution, lowering the voting age to 18, thereby putting the amendment into effect.

Nigeria bans Red Cross aid to Biafra.

Pope Paul VI issues the ''Credo of the People of God''.

Ciaculli massacre: a car bomb, intended for Mafia boss Salvatore Greco, kills seven between police officers and military personnel near Palermo.

Congo gains independence from Belgium.

A United States Air Force F-100 Super Sabre from Kadena Air Base, Okinawa, crashes into a nearby elementary school, killing 11 students plus six residents from the local neighborhood.

A TWA Super Constellation and a United Airlines DC-7 (Flight 718) collide above the Grand Canyon in Arizona, United States, killing all 128 on board the two planes.

The first Chevrolet Corvette rolls off the assembly line in Flint, Michigan.

World War II: The Battle of Cherbourg ends with the fall of the strategically valuable port to American forces.

World War II: Operation Barbarossa

Emperor Haile Selassie of Abyssinia appeals for aid to the League of Nations against Italy's invasion of his country.

The Senegalese Socialist Party holds its first congress.

The Night of the Long Knives, Adolf Hitler's violent purge of his political rivals in Germany, takes place.

U.S. President Warren G. Harding appoints former President William Howard Taft Chief Justice of the United States.

The Regina Cyclone hits Regina, Saskatchewan, killing 28. It remains Canada's deadliest tornado event.

The Tunguska event occurs in remote Siberia.

The United States Congress passes the Meat Inspection Act and Pure Food and Drug Act.

Albert Einstein publishes the article "On the Electrodynamics of Moving Bodies", in which he introduces special relativity.

The first transcontinental train trip across Canada departs from Montreal. It arrives in Port Moody, British Columbia on July 4.

Charles J. Guiteau is hanged in Washington, D.C. for the assassination of U.S. President James Garfield.

U.S. President Abraham Lincoln grants Yosemite Valley to California for "public use, resort and recreation".

The 1860 Oxford evolution debate at the Oxford University Museum of Natural History takes place.

French acrobat Charles Blondin crosses Niagara Falls on a tightrope.

The U.S. Congress organizes the Michigan Territory.

Native American forces under Blue Jacket attack Fort Recovery.

Seven Years' War: The Battle of Domstadtl takes place.

The Immortal Seven issue the Invitation to William (continuing the English rebellion from Rome), which would culminate in the Glorious Revolution.

The Deluge (Polish history)|The Deluge: Khmelnytsky Uprising

King Henry II of France is seriously injured in a jousting match against Gabriel de Montgomery.

The Spaniards are expelled from Tenochtitlan.

Battle of Arbedo between the duke of Milan and the Swiss cantons.

Roman usurper Nepotianus, of the Constantinian dynasty, is defeated and killed by troops of the usurper Magnentius, in Rome).