Wikipedia:Selected anniversaries/June 20

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 * 1782 – The Congress of the Confederation adopted the Great Seal of the United States (obverse pictured), used to authenticate documents issued by the U.S. federal government.
 * 1900 – Boxer Rebellion: The Imperial Chinese Army began a 55-day siege of the Legation Quarter in Peking.
 * 1921 – Workers at the Buckingham and Carnatic Mills in Madras, India, began a four-month strike.
 * 1926 – Approximately 250,000 spectators attended the opening procession of the 28th International Eucharistic Congress in Chicago, United States.
 * 1943 – World War II: The Royal Air Force began Operation Bellicose, a four-day shuttle-bombing mission that included raids on Germany and Italy and a refuelling and rearming stop in Algeria.
 * 1947 – A Mafia hitman murdered gangster Bugsy Siegel, one of the driving forces in the development of the Las Vegas Strip, in Beverly Hills, California.
 * 1960 – The Mali Federation gained independence from France, but dissolved into Mali and Senegal two months later.
 * 1975 – Steven Spielberg's film Jaws was released; it became a summer blockbuster and the first film to earn $100 million in U.S. theatrical rentals.
 * 1994 – A bomb explosion in the Imam Reza shrine in Mashhad, Iran, left at least 25 dead and more than 70 injured.
 * 2009 – Iranian student Neda Agha-Soltan was shot dead in Tehran during the presidential election protests; footage of her death was widely distributed over the Internet, making it "probably the most widely witnessed death in human history".
 * 2019 – Iranian aircraft shot down an American drone over the Strait of Hormuz amid heightened tensions between the two countries.
 * Born/died: | Adalbert of Magdeburg |d|981| Sigismund III Vasa |b|1566| Anna Laetitia Barbauld |b|1743| Gina Krog |b|1847| Juan Larrea |d|1847| Władysław Tryliński |b|1878| Mary R. Calvert|b|1884| Voltairine de Cleyre |d|1912| Fritz Koenig |b|1924| Enn Vetemaa |b|1936| Edith Windsor |b|1929| Olympia Dukakis |b|1931| Ulf Merbold |b|1941| André Watts |b|1946| Ulrich Mühe |b|1953| Chanchal Kumar Majumdar |d|2000|

June 20: World Refugee Day


 * 1837 – Queen Victoria (pictured) acceded to the British throne, beginning a 63-year reign.
 * 1921 – British Army officer Thomas Stanton Lambert was assassinated by the Irish Republican Army near Moydrum, Ireland.
 * 1959 – The extratropical remnants of an Atlantic hurricane reached the Gulf of St. Lawrence in Canada, causing 22 fishing boats to capsize and killing 35 people.
 * 1979 – Bill Stewart, an American journalist, was executed by Nicaraguan Guardia forces.
 * 1982 – The International Conference on the Holocaust and Genocide, the first major conference in genocide studies, opened despite Turkish attempts to cancel it due to the inclusion of presentations on the Armenian genocide.