Today's Historical Events - per Wikipedia

June 30

• 350 – Roman usurper Nepotianus, of the Constantinian dynasty, is defeated and killed by troops of the usurper Magnentius, in Rome.
• 1422 – Battle of Arbedo between the duke of Milan and the Swiss cantons.
• 1520 – Spanish conquistadors led by Hernán Cortés fight their way out of Tenochtitlan.
• 1559 – King Henry II of France is mortally wounded in a jousting match against Gabriel de Montgomery.
• 1651 – The Deluge: Khmelnytsky Uprising – the Battle of Beresteczko ends with a Polish victory.
• 1688 – The Immortal Seven issue the Invitation to William (continuing the English rebellion from Rome), which would culminate in the Glorious Revolution.
• 1758 – Seven Years' War: The Battle of Domstadtl takes place.
• 1794 – Native American forces under Blue Jacket attack Fort Recovery.
• 1805 – The U.S. Congress organizes the Michigan Territory.
• 1859 – French acrobat Charles Blondin crosses Niagara Falls on a tightrope.
• 1860 – The 1860 Oxford evolution debate at the Oxford University Museum of Natural History takes place.
• 1864 – U.S. President Abraham Lincoln grants Yosemite Valley to California for "public use, resort and recreation".
• 1882 – Charles J. Guiteau is hanged in Washington, D.C. for the assassination of U.S. President James Garfield.
• 1886 – The first transcontinental train trip across Canada departs from Montreal. It arrives in Port Moody, British Columbia on July 4.
• 1905 – Albert Einstein publishes the article "On the Electrodynamics of Moving Bodies", in which he introduces special relativity.
• 1906 – The United States Congress passes the Meat Inspection Act and Pure Food and Drug Act.
• 1908 – The Tunguska event occurs in remote Siberia.
• 1912 – The Regina Cyclone hits Regina, Saskatchewan, killing 28. It remains Canada's deadliest tornado event.
• 1921 – U.S. President Warren G. Harding appoints former President William Howard Taft Chief Justice of the United States.
• 1934 – The Night of the Long Knives, Adolf Hitler's violent purge of his political rivals in Germany, takes place.
• 1935 – The Senegalese Socialist Party holds its first congress.
• 1936 – Emperor Haile Selassie of Abyssinia appeals for aid to the League of Nations against Italy's invasion of his country.
• 1941 – World War II: Operation Barbarossa – Germany captures Lviv, Ukraine.
• 1944 – World War II: The Battle of Cherbourg ends with the fall of the strategically valuable port to American forces.
• 1953 – The first Chevrolet Corvette rolls off the assembly line in Flint, Michigan.
• 1956 – 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.
• 1959 – 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.
• 1960 – Congo gains independence from Belgium.
• 1963 – Ciaculli massacre: a car bomb, intended for Mafia boss Salvatore Greco, kills seven between police officers and military personnel near Palermo.
• 1968 – Pope Paul VI issues the Credo of the People of God.
• 1969 – Nigeria bans Red Cross aid to Biafra.
• 1971 – The crew of the Soviet Soyuz 11 spacecraft are killed when their air supply escapes through a faulty valve.
• 1971 – Ohio ratifies the 26th Amendment to the U.S. Constitution, lowering the voting age to 18, thereby putting the amendment into effect.
• 1972 – The first leap second is added to the UTC time system.
• 1977 – The Southeast Asia Treaty Organization disbands.
• 1985 – Thirty-nine American hostages from the hijacked TWA Flight 847 are freed in Beirut after being held for 17 days.
• 1986 – The U.S. Supreme Court rules in Bowers v. Hardwick that states can outlaw homosexual acts between consenting adults.
• 1987 – The Royal Canadian Mint introduces the $1 coin, known as the Loonie.
• 1990 – East Germany and West Germany merge their economies.
• 1991 – 32 miners are killed when a coal mine catches fire in the Donbass region of Ukraine and releases toxic gas.
• 1992 – Former Prime Minister Margaret Thatcher joins the House of Lords as Baroness Thatcher.
• 1997 – The United Kingdom transfers sovereignty over Hong Kong to the People's Republic of China.
• 2009 – Yemenia Flight 626 crashes into the Indian Ocean, near Comoros, killing all but one of the 153 passengers and crew on board.