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Eruption of Mount St. Helens
in the United States (2013)
Armed Forces Day refimprove
1268 – Baibars and his Mamluk forces captured Antioch, capital of the crusader state, the Principality of Antioch.
needs more footnotes
1848 – During the aftermath of the March Revolution in the German Confederation, the opened in Frankfurt Parliament Paulskirche, Frankfurt.
needs more footnotes
1912 – The first , Indian film by Shree Pundalik Dadasaheb Torne, was released.
1926 – Evangelist disappeared near Aimee Semple McPherson California's Venice Beach, and generated much media coverage before being found 35 days later in Agua Prieta, Sonora, Mexico.
1933 – U.S. President Franklin D. Roosevelt signed an act establishing the to stimulate the Tennessee Valley Authority economic development of the Tennessee Valley, a region particularly impacted by the Great Depression.
1944 – World War II: Polish forces under Lieutenant General Władysław Anders captured Monte Cassino, Italy, after a four-month battle.
1948 – The first session of the convened in the then-Chinese capital of Legislative Yuan of the Republic of China Nanjing.
1953 – At Rogers Dry Lake, California, in her Canadair Sabre, American became the first female pilot to break the Jackie Cochran sound barrier.
1958 – The , a supersonic Lockheed F-104 Starfighter interceptor aircraft, set a then- world speed record of 1,404.19 miles per hour (2,259.82 km/h).
1965 – , a spy who is credited with gathering significant intelligence for Israel in the Eli Cohen Six-Day War against Syria, was publicly hanged after having been captured four months earlier.
1980 – against the nationwide A popular uprising martial law imposed by South Korean President Chun Doo-hwan's government began in Gwangju, but it was ultimately crushed by the army about nine days later.
1991 – The Somali National Movement declared the independence of , a Somaliland de facto state that is internationally recognised as an autonomous region of Somalia, following the collapse of central government during the Somali Civil War.
2005 – A second photo by the Hubble Space Telescope confirmed the discovery of two new moons of Pluto: and Nix .
Hydra Nix: needs expansion
1863 – American Civil War: General Ulysses S. Grant led his Army of the Tennessee across the Big Black River in preparation for the . Siege of Vicksburg
1927 – Disgruntled school board treasurer Andrew Kehoe set off in the a series of explosives Bath Consolidated School, killing 44 people in the deadliest mass murder in a school in United States history.
1936 – In a crime that shocked Japan, strangled her lover Kichizo Ishida, cut off his Sada Abe genitals, and carried them around with her for several days until her arrest.
1974 – India conducted at its first nuclear test explosion Pokhran, the first confirmed nuclear test by a nation outside the five permanent members of the United Nations Security Council.
1980 – The stratovolcano Mount St. Helens , killing 57 people in southern erupted Washington State, reducing hundreds of square miles to wasteland, and causing over US$1 billion in damage.
2009 – The Sri Lanka Army killed , the leader and founder of the Velupillai Prabhakaran Liberation Tigers of Tamil Eelam, to bring an end to the 26-year Sri Lankan Civil War. Born/died this day: (d. 1922) Charles Louis Alphonse Laveran · (b. 1946) Frank Hsieh · (d. 1955) Mary McLeod Bethune
: May 18 in Haiti; Flag and Universities Day in Turkmenistan
Day of Revival, Unity, and the Poetry of Magtymguly
Vietnamese refugees transferring ships
(b. 1777) John George Children · (b. 1889) Thomas Midgley Jr. · (d. 1980)