Wikipedia:Selected anniversaries/April 30

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 * 1006 – SN 1006 (remnant pictured), the brightest supernova in recorded history, first appeared in the constellation Lupus.
 * 1789 – George Washington took the oath of office as the first president of the United States at Federal Hall in New York City.
 * 1803 – The United States purchased France's claim to the Louisiana Territory for 80 million francs, or less than US$.03 per acre ($.07/ha).
 * 1883 – New York governor Grover Cleveland signed legislation that led to the creation of Niagara Falls State Park, the United States' first state park.
 * 1894 – A crowd of workers, unemployed due to the Panic of 1893, concluded the first significant popular protest march on Washington D.C.
 * 1897 – British physicist J. J. Thomson and his team announce the discovery of the electron.
 * 1927 – The Federal Industrial Institute for Women opened near Alderson, West Virginia, as the first federal prison for women in the United States.
 * 1927 – Douglas Fairbanks and Mary Pickford became the first two celebrities to make imprints of their hands and feet in cement (Pickford's pictured) at Grauman's Chinese Theatre in Hollywood, California.
 * 1945 – World War II: As Allied forces closed in on Berlin, Nazi leader Adolf Hitler committed suicide in the Führerbunker with Eva Braun one day after their marriage.
 * 1982 – Sixteen monks and a nun of the Hindu organisation Ananda Marga were beaten to death and set on fire in Calcutta, India.
 * 1994 - Riverdance was performed for the first time, as the interval act for the Eurovision Song Contest.
 * 2000 – Faustina Kowalska, a Polish nun whose apparitions of Jesus inspired the Catholic devotion to the Divine Mercy, was canonized by Pope John Paul II.
 * 2004 – The New Yorker published an online article and photographs detailing accounts of torture and abuse by American military personnel of Iraqi prisoners held at Abu Ghraib prison in Baghdad.
 * 2009 – A Dutch man drove his car at high speed into a parade in an attempt to kill the Dutch royal family.
 * Born/died: | Jean-Baptiste de La Salle |b|1651| Robert Plot |d|1696| Rodrigo Anes de Sá Almeida e Meneses |d|1733| Joseph Dart |b|1799| Eugen Bleuler |b|1857| Dadasaheb Phalke |b|1870| Luigi Russolo |b|1885| Dorival Caymmi |b|1914| Roger L. Easton |b|1921| Alben W. Barkley |d|1956| Meredith L. Patterson |b|1977