June 30 events in history

350 Roman usurper Nepotianus, of the Constantinian dynasty, is defeated and killed in Rome by troops of the usurper Magnentius
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
1521 Spanish forces defeat a combined French and Navarrese army at the Battle of Noáin during the Spanish conquest of Iberian Navarre
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
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
1892 The Homestead Strike begins near Pittsburgh, Pennsylvania
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
1917 World War I: Greece declares war on the Central Powers
1921 U.S. President Warren G. Harding appoints former President William Howard Taft Chief Justice of the United States
1922 In Washington D.C., U.S. Secretary of State Charles Evans Hughes and Dominican Ambassador Francisco J. Peynado sign the Hughes-Peynado agreement, which ends the United States occupation of the Dominican Republic
1934 The Night of the Long Knives, Adolf Hitler's violent purge of his political rivals in Germany, takes place
1936 Emperor Haile Selassie of Abyssinia appeals for aid to the League of Nations against Italy's invasion of his country
1937 The world's first emergency telephone number, 999, is introduced in London
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 collide above the Grand Canyon in Arizona and crash, killing all 128 on board both airliners
1960 Congo gains independence from Belgium
1963 Ciaculli massacre: a car bomb, intended for Mafia boss Salvatore Greco, kills seven police officers and military personnel near Palermo
1966 The National Organization for Women, the United States' largest feminist organization, is founded
1968 Pope Paul VI issues the Credo of the People of God
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, reducing 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
1990 East Germany and West Germany merge their economies
1997 The United Kingdom transfers sovereignty over Hong Kong to the People's Republic of China