1913 – Raja Harishchandra, the first full-length Indian feature film, is released, marking the beginning of the Indian film industry.

1921 – Ireland is partitioned under British law by the Government of Ireland Act 1920, creating Northern Ireland and Southern Ireland.

1948 – The U.S. Supreme Court rules in Shelley v. Kraemer that covenants prohibiting the sale of real estate to blacks and other minorities are legally unenforceable.

1978 – The first unsolicited bulk commercial email (which would later become known as "spam") is sent by a Digital Equipment Corporation marketing representative to every ARPANET address on the west coast of the United States.

1979 – The Conservative Party wins the United Kingdom general election.<13> The following day, Margaret Thatcher becomes the first female British Prime Minister.

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Exactly 12 years later in Berlin...

1986 – Chernobyl disaster: The City of Chernobyl is evacuated six days after the disaster.

2000 – President Bill Clinton announces that accurate GPS access would no longer be restricted to the United States military.

1707 – The Act of Union joining England and Scotland to form the Kingdom of Great Britain takes effect.

1807 – The Slave Trade Act 1807 takes effect, abolishing the slave trade within the British Empire.

1866 – The Memphis Race Riots begin. Over three days, 46 blacks and two whites were killed. Reports of the atrocities influenced passage of the Fourteenth Amendment to the United States Constitution.

1886 – Rallies are held throughout the United States demanding the eight-hour work day, culminating in the Haymarket affair in Chicago, in commemoration of which May 1 is celebrated as International Workers' Day in many countries.

1894 – Coxey's Army, the first significant American protest march, arrives in Washington, D.C.

2009 – Same-sex marriage is legalized in Sweden.

67 years ago, mom and dad decided to become a couple, meeting at a "Tanz in den Mai".

1789 – On the balcony of Federal Hall on Wall Street in New York City, George Washington takes the oath of office to become the first President of the United States.

1803 – Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million, more than doubling the size of the young nation.

1885 – Governor of New York David B. Hill signs legislation creating the Niagara Reservation, New York's first state park, ensuring that Niagara Falls will not be devoted solely to industrial and commercial use.

1897 – J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.

1905 – Albert Einstein completes his doctoral thesis at the University of Zurich.

1939 – NBC inaugurates its regularly scheduled television service in New York City, broadcasting President Franklin D. Roosevelt's N.Y. World's Fair opening day ceremonial address.

1945 – World War II: Führerbunker: Adolf Hitler and Eva Braun commit suicide after being married for less than 40 hours. Soviet soldiers raise the Victory Banner over the Reichstag building.

1961 – K-19, the first Soviet nuclear submarine equipped with nuclear missiles, is commissioned.

1945 – Dachau concentration camp is liberated by United States troops.

1992 – Riots in Los Angeles begin, following the acquittal of police officers charged with excessive force in the beating of Rodney King. Over the next three days 63 people are killed and hundreds of buildings are destroyed.

1997 – The Chemical Weapons Convention of 1993 enters into force, outlawing the production, stockpiling and use of chemical weapons by its signatories.

2015 – A baseball game between the Baltimore Orioles and the Chicago White Sox sets the all-time low attendance mark for Major League Baseball. Zero fans were in attendance for the game, as the stadium was officially closed to the public due to the 2015 Baltimore protests.

1945 – Benito Mussolini and his mistress Clara Petacci are shot dead by Walter Audisio, a member of the Italian resistance movement.

1945 – The Holocaust: Nazi Germany carries out its final use of gas chambers to execute 33 Upper Austrian socialist and communist leaders in Mauthausen concentration camp.

1948 – Igor Stravinsky conducts the premiere of his American ballet, Orpheus at the New York City Center.

1967 – Vietnam War: Boxer Muhammad Ali refuses his induction into the United States Army and is subsequently stripped of his championship and license.

1970 – Vietnam War: US President Richard Nixon formally authorizes American combat troops to take part in the Cambodian campaign.

1973 – The Dark Side of the Moon by Pink Floyd, recorded in Abbey Road Studios goes to number one on the US Billboard chart, beginning a record-breaking 741-week chart run.

1986 – High levels of radiation resulting from the Chernobyl disaster are detected at Forsmark Nuclear Power Plant in Sweden, leading Soviet authorities to publicly announce the accident.

2004 – CBS News releases evidence of the Abu Ghraib torture and prisoner abuse. The photographs show rape and abuse from the American troops over Iraqi detainees.

 Red_Dragon wrote:

Still waiting for the American National Congress. It's a matter of time, only. When all exploited people detest the fata-morgana of democracy the majority will not be black by skin but by kin through suffering.

Trump is hitting the gas-pedal!

1861 – American President Abraham Lincoln suspends the writ of habeas corpus.

1986 – The city of Pripyat and surrounding areas are evacuated due to the Chernobyl disaster.

1933 – The Gestapo, the official secret police force of Nazi Germany, is established by Hermann Göring.

1986 – The Chernobyl disaster occurs in the Ukrainian Soviet Socialist Republic.

1989 – The deadliest known tornado strikes Central Bangladesh, killing upwards of 1,300, injuring 12,000, and leaving as many as 80,000 homeless.

1994 – South Africa begins its first multiracial election, which is won by Nelson Mandela's African National Congress.

1933 – Nazi Germany issues the Law Against Overcrowding in Schools and Universities limiting the number of Jewish students able to attend public schools and universities.

1953 – Francis Crick and James Watson publish "Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid" describing the double helix structure of DNA. Their work was largely based on the earlier efforts of Rosalind Franklin.

1954 – The first practical solar cell is publicly demonstrated by Bell Telephone Laboratories.

2014 – The Flint water crisis begins when officials at Flint, Michigan switch the city's water supply to the Flint River, leading to lead and bacteria contamination.

1800 – The United States Library of Congress is established when President John Adams signs legislation to appropriate $5,000 to purchase "such books as may be necessary for the use of Congress".

1933 – Nazi Germany begins its persecution of Jehovah's Witnesses by shutting down the Watch Tower Society office in Magdeburg.

1990 – STS-31: The Hubble Space Telescope is launched from the Space Shuttle Discovery.

1516 – The Munich Reinheitsgebot (regarding the ingredients of beer) takes effect in all of Bavaria.

1635 – The first public school in the United States, the Boston Latin School, is founded.

2005 – The first YouTube video, titled "Me at the zoo", is published by co-founder Jawed Karim.

1864 – The U.S. Congress passes the Coinage Act of 1864 that permitted the inscription In God We Trust be placed on all coins minted as United States currency.

1970 – The first Earth Day is celebrated.

2016 – The Paris Agreement is signed, an agreement to help fight global warming.

2014 – The American city of Flint, Michigan switches its water source to the Flint River, beginning the ongoing Flint water crisis which has caused lead poisoning in up to 12,000 people, and at least 12 deaths from Legionnaires' disease, ultimately leading to criminal indictments against 15 people, five of whom have been charged with involuntary manslaughter.

2010 – The Deepwater Horizon drilling rig explodes in the Gulf of Mexico, killing eleven workers and beginning an oil spill that lasted six months.

2020 – For the first time in history, oil prices drop below zero, an effect of the 2020 Russia-Saudi Arabia oil price war.

2021 – State of Minnesota v. Derek Michael Chauvin: Derek Chauvin is found guilty of all charges in the murder of George Floyd by the Fourth Judicial District Court of Minnesota.

1775 – American Revolutionary War: The war begins during the Battles of Lexington and Concord with a victory of American minutemen and other militia over British forces, later referred to as the "shot heard round the world".

1927 – Mae West is sentenced to ten days in jail for obscenity for her play Sex.

1943 – Albert Hofmann deliberately doses himself with LSD for the first time, three days after having discovered its effects on April 16, an event commonly known and celebrated as Bicycle Day.

1987 – The Simpsons first appear as a series of shorts on The Tracey Ullman Show, first starting with "Good Night".

1993 – The 51-day FBI siege of the Branch Davidian building in Waco, Texas, US, ends when a fire breaks out. Seventy-six Davidians, including 18 children under age 10, died in the fire.

1995 – Oklahoma City bombing: The Alfred P. Murrah Federal Building in Oklahoma City, US, is bombed, killing 168 people including 19 children under the age of six.

2011 – Fidel Castro resigns as First Secretary of the Communist Party of Cuba after holding the title since July 1961.

2021 – The Ingenuity helicopter becomes the first aircraft to achieve flight on another planet.

1783 – Three-Fifths Compromise: The first instance of black slaves in the United States of America being counted as three-fifths of persons (for the purpose of taxation), in a resolution of the Congress of the Confederation. This was later adopted in the 1787 Constitution.

1938 – Superman debuts in Action Comics #1 (cover dated June 1938).

1946 – Jackie Robinson makes his regular season debut for the Montreal Royals of the International League, to make them the first integrated modern professional baseball team.

1996 – The Israeli military commits the Qana massacre in a deliberate shelling of a United Nations compound near the village of Qana in southern Lebanon, killing 106 Lebanese civilians who were taking shelter there and wounding over 100 more.

2019 – A redacted version of the Mueller report is released to the United States Congress and the public.