On This Day - What happened 21 April

An April 21, 1791, news report of the April 15 dedication ceremony for the first boundary stone (the south cornerstone) stated that it was Andrew Ellicott who "ascertained the precise point from which the first line of the district was to proceed". The news report did not mention Banneker's name.

Napoleon realigned the axis of his army and marched his soldiers towards the town of Eckmühl. The French scored a convincing win in the resulting Battle of Eckmühl, forcing Charles to withdraw his forces over the Danube and into Bohemia.

On April 2, 1849, a delegation of the National Assembly met with King Frederick William IV in Berlin and offered him the crown of the Emperor under this new constitution.

Labor Day in Australia is a public holiday on dates which vary between states and territories. It is the first Monday in October in the Australian Capital Territory, New South Wales and South Australia. In Victoria and Tasmania, it is the second Monday in March (though the latter calls it Eight Hours Day). In Western Australia, Labor Day is the first Monday in March. In Queensland and the Northern Territory, Labor Day occurs on the first Monday in May (though the latter calls it May Day). It is on the fourth Monday of March in the territory of Christmas Island. The first march for an eight-hour day by the labor movement occurred in Melbourne on 21 April 1856.

The late President lay in state, first in the East Room of the White House, and then in the Capitol Rotunda from April 19 through April 21. The caskets containing Lincoln's body and the body of his son Willie traveled for three weeks on the Lincoln Special funeral train. The train followed a circuitous route from Washington D.C. to Springfield, Illinois, stopping at many cities for memorials attended by hundreds of thousands.

On 21 April 1943, de Gaulle was scheduled to fly in a Wellington bomber to Scotland to inspect the Free French Navy.

Early in the Second World War, John Maynard Keynes of the British Treasury and Harry Dexter White of the United States Treasury Department independently began to develop ideas about the financial order of the postwar world. After negotiation between officials of the United States and United Kingdom, and consultation with some other Allies, a "Joint Statement by Experts on the Establishment of an International Monetary Fund," was published simultaneously in a number of Allied countries on April 21, 1944.

By 21 April, Georgy Zhukov's 1st Belorussian Front had broken through the defenses of General Gotthard Heinrici's Army Group Vistula during the Battle of the Seelow Heights and advanced to the outskirts of Berlin.

On 21 April, Himmler met with Norbert Masur, a Swedish representative of the World Jewish Congress, to discuss the release of Jewish concentration camp inmates.

Keynes died of a heart attack at Tilton, his farmhouse home near Firle, East Sussex, England, on 21 April 1946, at the age of 62.

After achieving decisive victory at Liaoshen, Huaihai and Pingjin campaigns, the CPC wiped out 144 regular and 29 irregular KMT divisions, including 1.54 million veteran KMT troops, which significantly reduced the strength of Nationalist forces. Stalin initially favored a coalition government in postwar China, and tried to persuade Mao to stop the CPC from crossing the Yangtze and attacking the KMT positions south of the river. Mao rejected Stalin's position and on 21 April, and began the Yangtze River Crossing Campaign.

On 21 April 1974, while the painting was on display at the Tokyo National Museum, a woman sprayed it with red paint as a protest against that museum's failure to provide access for disabled people.

On 21 April, however, the exhausted garrison was ordered to withdraw towards Saigon. An embittered and tearful president Thieu resigned on the same day, declaring that the United States had betrayed South Vietnam. In a scathing attack, he suggested U.S. Secretary of State Henry Kissinger had tricked him into signing the Paris peace agreement two years earlier, promising military aid that failed to materialize.

The first landings of SAS troops took place on 21 April, but—with the southern hemisphere autumn setting in—the weather was so bad that their landings and others made the next day were all withdrawn after two helicopters crashed in fog on Fortuna Glacier.

On April 21, students began organizing under the banners of formal organizations.

On April 21, senior police investigators held a press conference to announce having apprehended about 20 suspects in the attacks of a total of nine people in Central Park two nights before, and began to offer their theory of the attack and rape of the female jogger. Her name was withheld as a victim of a sex crime. The police said up to 12 youths were believed to have attacked the jogger.

Although a Russian guided missile attack assassinated the ChRI President Dzhokhar Dudayev on 21 April 1996.

WHO announced that cumulative number of cases reached 8096 and number of deaths reached 774.

On April 21, 2005, the NYSE announced its plans to merge with Archipelago in a deal intended to reorganize the NYSE as a publicly-traded company.

UNCTAD XII was held in Accra, Ghana, from 21 to 25 April 2008.

Zoom was founded by Eric Yuan, a former corporate vice president for Cisco Webex.

UNCTAD XIII was held in Doha, Qatar, from 21 to 26 April 2012.