Historical Events on this Day in History - per Wikipedia

July 21

• 356 BC – The Temple of Artemis in Ephesus, one of the Seven Wonders of the World, is destroyed by arson.
• 230 – Pope Pontian succeeds Urban I as the eighteenth pope.
• 285 – Diocletian appoints Maximian as Caesar and co-ruler.
• 365 – A tsunami devastates the city of Alexandria, Egypt. The tsunami was caused by the Crete earthquake estimated to be 8.0 on the Richter Scale. 5,000 people perished in Alexandria, and 45,000 more died outside the city.
• 1403 – Battle of Shrewsbury: King Henry IV of England defeats rebels to the north of the county town of Shropshire, England.
• 1545 – The first landing of French troops on the coast of the Isle of Wight during the French invasion of the Isle of Wight.
• 1568 – Eighty Years' War: Battle of Jemmingen – Fernando Álvarez de Toledo, Duke of Alva defeats Louis of Nassau.
• 1718 – The Treaty of Passarowitz between the Ottoman Empire, Austria and the Republic of Venice is signed.
• 1774 – Russo-Turkish War, 1768-1774: Russia and the Ottoman Empire sign the Treaty of Kuchuk-Kainarji ending the war.
• 1831 – Inauguration of Leopold I of Belgium, first king of the Belgians.
• 1861 – American Civil War: First Battle of Bull Run – at Manassas Junction, Virginia, the first major battle of the war begins and ends in a victory for the Confederate army.
• 1865 – In the market square of Springfield, Missouri, Wild Bill Hickok shoots and kills Davis Tutt in what is regarded as the first western showdown.
• 1873 – At Adair, Iowa, Jesse James and the James-Younger Gang pull off the first successful train robbery in the American Old West.
• 1877 – After rioting by Baltimore and Ohio Railroad workers and the deaths of nine rail workers at the hands of the Maryland militia, workers in Pittsburgh, Pennsylvania stage a sympathy strike that is met with an assault by the state militia.
• 1904 – Louis Rigolly, a Frenchman, becomes the first man to break the 100 mph (161 km/h) barrier on land. He drove a 15-liter Gobron-Brille in Ostend, Belgium.
• 1914 – The Crown council of Romania decides the country shall remain neutral in World War I
• 1918 – U-156 shells Nauset Beach, in Orleans, Massachusetts.
• 1919 – The dirigible Wingfoot Air Express crashes into the Illinois Trust and Savings Building in Chicago, killing 12 people.
• 1925 – Scopes Trial: In Dayton, Tennessee, high school biology teacher John T. Scopes is found guilty of teaching evolution in class and fined $100.
• 1925 – Sir Malcolm Campbell becomes the first man to break the 150 mph (241 km/h) land barrier at Pendine Sands in Wales. He drove a Sunbeam at a two-way average speed of 150.33 mph (242 km/h).
• 1944 – World War II: Battle of Guam – American troops land on Guam starting the battle. It would end on August 10.
• 1944 – World War II: Claus Schenk Graf von Stauffenberg and fellow conspirators are executed in Berlin, Germany for the July 20 plot to assassinate Adolf Hitler.
• 1949 – The United States Senate ratifies the North Atlantic Treaty.
• 1954 – First Indochina War: The Geneva Conference partitions Vietnam into North Vietnam and South Vietnam.
• 1959 – Elijah Jerry "Pumpsie" Green becomes the first African-American to play for the Boston Red Sox, the last team to integrate. He came in as a pinch runner for Vic Wertz and stayed in as shortstop in a 2-1 loss to the Chicago White Sox.
• 1961 – Mercury program: Mercury-Redstone 4 Mission – Gus Grissom piloting Liberty Bell 7 becomes the second American to go into space (in a suborbital mission).
• 1969 – Space Race: Neil Armstrong and Edwin "Buzz" Aldrin become the first humans to walk on the Moon, during the Apollo 11 mission (July 20th in North America).
• 1970 – After 11 years of construction, the Aswan High Dam in Egypt is completed.
• 1972 – Bloody Friday bombings by the Provisional IRA around Belfast, Northern Ireland – 22 bombs are detonated, killing 9 and seriously injuring 130.
• 1973 – In the Lillehammer affair in Norway, Israeli Mossad agents kill a waiter whom they mistakenly thought was involved in 1972's Munich Olympics Massacre.
• 1976 – Christopher Ewart-Biggs British ambassador to the Republic of Ireland is assassinated by the Provisional IRA.
• 1977 – The start of the four day long Libyan-Egyptian War.
• 1983 – The world's lowest temperature is recorded at Vostok Station, Antarctica at −89.2 °C (−128.6 °F).
• 1995 – Third Taiwan Strait Crisis: The People's Liberation Army begins firing missiles into the waters north of Taiwan.
• 1997 – The fully restored USS Constitution (aka Old Ironsides) celebrates her 200th birthday by setting sail for the first time in 116 years.
• 2001 – At the conclusion of a fireworks display on Okura Beach in Akashi, Hyōgo, Japan, 11 people are killed and more than 120 are injured when a pedestrian footbridge connecting the beach to JR Asagiri railway station becomes overcrowded and people leaving the event fall down in a domino effect.
• 2005 – Four terrorist bombings, occurring exactly two weeks after the similar July 7 bombings, target London's public transportation system. All four bombs fail to detonate and all four suspected suicide bombers are captured and later convicted and imprisoned for long terms.