June 20 events in history

451 Battle of Chalons: Flavius Aetius' battles Attila the Hun. After the battle, which was inconclusive, Attila retreats, causing the Romans to interpret it as a victory
1214 The University of Oxford receives its Royal charter
1631 The sack of Baltimore: the Irish village of Baltimore is attacked by Algerian pirates
1652 Tarhoncu Ahmet Paşa is appointed grand vezir of the Ottoman Empire
1685 Monmouth Rebellion: James Scott, 1st Duke of Monmouth declares himself King of England at Bridgwater
1756 A British garrison is imprisoned in the Black Hole of Calcutta
1782 The U.S. Congress adopts the Great Seal of the United States
1787 Oliver Ellsworth moves at the Federal Convention to call the government the United States
1789 Deputies of the French Third Estate take the Tennis Court Oath
1819 The U.S. vessel SS Savannah arrives at Liverpool, United Kingdom. It is the first steam-propelled vessel to cross the Atlantic, although most of the journey is made under sail
1837 Queen Victoria succeeds to the British throne
1840 Samuel Morse receives the patent for the telegraph
1862 Barbu Catargiu, the Prime Minister of Romania, is assassinated
1863 American Civil War: West Virginia is admitted as the 35th U.S. state
1877 Alexander Graham Bell installs the world's first commercial telephone service in Hamilton, Ontario, Canada
1887 Victoria Terminus, the busiest railway station in India, opens in Bombay
1893 Lizzie Borden is acquitted of the murders of her father and stepmother
1895 The Kiel Canal, crossing the base of the Jutland peninsula and the busiest artificial waterway in the world, is officially opened
1900 Boxer Rebellion: The Imperial Chinese Army begins a 55-day siege of the Legation Quarter in Beijing, China
1900 Baron Eduard Toll, leader of the Russian Polar Expedition of 1900, departs Saint Petersburg in Russia on the explorer ship Zarya, never to return
1921 Workers of Buckingham and Carnatic Mills in the city of Chennai, India, begin a four-month strike
1940 World War II: Italy begins an unsuccessful invasion of France
1942 The Holocaust: Kazimierz Piechowski and three others, dressed as members of the SS-Totenkopfverbände, steal an SS staff car and escape from the Auschwitz concentration camp
1943 The Detroit Race Riot breaks out and continues for three more days
1944 World War II: The Battle of the Philippine Sea concludes with a decisive U.S. naval victory. The lopsided naval air battle is also known as the "Great Marianas Turkey Shoot"
1944 Continuation war: the Soviet Union demands an unconditional surrender from Finland during the beginning of partially successful Vyborg–Petrozavodsk Offensive. The Finnish government refuses
1945 The United States Secretary of State approves the transfer of Wernher von Braun and his team of Nazi rocket scientists to America
1948 Toast of the Town, later The Ed Sullivan Show, makes its television debut
1956 A Venezuelan Super-Constellation crashes in the Atlantic Ocean off Asbury Park, New Jersey, killing 74 people
1959 A rare June hurricane strikes Canada's Gulf of St. Lawrence killing 35
1960 The Mali Federation gains independence from France (it later splits into Mali and Senegal)
1963 The so-called "red telephone" link is established between the Soviet Union and the United States following the Cuban Missile Crisis
1972 Watergate scandal: An 18½-minute gap appears in the tape recording of the conversations between U.S. President Richard Nixon and his advisers regarding the recent arrests of his operatives while breaking into the Watergate complex
1973 Ezeiza massacre in Buenos Aires, Argentina. Snipers fire upon left-wing Peronists. At least 13 are killed and more than 300 are injured
1979 ABC News correspondent Bill Stewart is shot dead by a Nicaraguan soldier under the regime of Anastasio Somoza Debayle. The murder is caught on tape and sparks an international outcry against the regime
1982 The Argentine base Corbeta Uruguay on Southern Thule surrenders to Royal Marine commandos in the final action of the Falklands War
1990 Asteroid Eureka is discovered
1991 The German Bundestag votes to move the capital from Bonn back to Berlin
2001 Andrea Yates, in an attempt to save her young children from Satan, drowns all five of them in a bathtub in Houston, Texas
2003 The Wikimedia Foundation is founded in St. Petersburg, Florida