April 3 in History

The Maya civilization was a Mesoamerican civilization that existed from antiquity to the early modern period. Known by its ancient temples and glyphs (script), the civilization is also noted for its art, architecture, mathematics, calendar, and astronomical system. The Maya script is the most sophisticated and highly developed writing system in the pre-Columbian Americas.

Polyeuctus of Constantinople (Greek: Πολύευκτος; died 5 February 970) was Ecumenical Patriarch of Constantinople (956–970). His orthodox feast is on 5 February.

Edward the Confessor (1003/1005 – 5 January 1066) was King of the English from 1042 until his death in 1066. He was the last reigning monarch of the House of Wessex. Edward was the son of Æthelred the Unready and Emma of Normandy. He succeeded Cnut the Great's son – and his own half-brother – Harthacnut. He restored the rule of the House of Wessex after the period of Danish rule since Cnut conquered England in 1016. When Edward died in 1066, he was succeeded by his brother-in-law Harold Godwinson, who was defeated and killed in the same year at the Battle of Hastings by the Normans under William the Conqueror. Edward's young great-nephew Edgar Ætheling of the House of Wessex was proclaimed king after the Battle of Hastings, but was never crowned and surrendered to William less than eight weeks after the battle. Historians disagree about Edward's fairly long 24-year reign. His nickname reflects the traditional image of him as unworldly and pious. The epithet "Confessor" reflects his reputation as a saint who did not suffer martyrdom as opposed to his uncle, King Edward the Martyr. Some portray Edward the Confessor's reign as leading to the disintegration of royal power in England and the advance in power of the House of Godwin, because of the infighting that began after his death with no heirs to the throne. Biographers Frank Barlow and Peter Rex, on the other hand, portray Edward as a successful king, one who was energetic, resourceful and sometimes ruthless; they argue that the Norman Conquest shortly after his death tarnished his image. However, Richard Mortimer argues that the return of the Godwins from exile in 1052 "meant the effective end of his exercise of power", citing Edward's reduced activity as implying "a withdrawal from affairs". About a century after his death, in 1161, Pope Alexander III canonised the king. Edward was one of England's national saints until King Edward III adopted Saint George as the national patron saint in about 1350. Edward's feast day is 13 October and is celebrated by both the Church of England and the Catholic Church.

Friuli is a historical region of northeast Italy. The region is marked by its separate regional and ethnic identity predominantly tied to the Friulians, who speak the Friulian language. It comprises the major part of the autonomous region Friuli-Venezia Giulia, i.e. the administrative provinces of Udine, Pordenone, and Gorizia, excluding Trieste.

The Treaty of Cateau-Cambrésis in April 1559 ended the Italian Wars (1494–1559). It consisted of two separate treaties, one between England and France on 2 April, and another between France and Spain on 3 April. Although he was not a signatory, both were approved by Emperor Ferdinand I, since many of the territorial exchanges concerned states within the Holy Roman Empire. Henry II of France abandoned claims on the Italian states ruled by Philip II of Spain (the southern kingdoms of Naples, Sicily, and Sardinia, along with the Duchy of Milan in the north), restored an independent Savoy, returned Corsica to Genoa, and formally recognised the Protestant Elizabeth I as queen of England, rather than her Catholic cousin, Mary, Queen of Scots. In exchange, France strengthened its southern, eastern and northern borders, confirming the occupation of the Three Bishoprics and the recapture of Calais from England.

A janissary was a member of the elite infantry units that formed the Ottoman sultan's household troops. They were one of the first modern standing armies, and perhaps the first infantry force in the world to be equipped primarily with firearms, adopted during the reign of Murad II. The corps was established under either Orhan or Murad I, and dismantled by Mahmud II in 1826.

Robert Walpole, 1st Earl of Orford (; 26 August 1676 – 18 March 1745), known between 1725 and 1742 as Sir Robert Walpole, was a British Whig statesman who is generally regarded as the de facto first Prime Minister of Great Britain, serving from 1721 to 1742. His formal titles included First Lord of the Treasury, Chancellor of the Exchequer, and Leader of the House of Commons. He is the longest serving prime minister in UK history, with a tenure of over 20 years. Although the exact dates of Walpole's dominance, dubbed the "Robinocracy", are a matter of scholarly debate, the period 1721–1742 is often used. He dominated the Walpole–Townshend ministry, as well as the subsequent Walpole ministry, and holds the record as the longest-serving British prime minister. W. A. Speck wrote that Walpole's uninterrupted run of 20 years as prime minister "is rightly regarded as one of the major feats of British political history. Explanations are usually offered in terms of his expert handling of the political system after 1720, [and] his unique blending of the surviving powers of the crown with the increasing influence of the Commons". Walpole was a Whig from the gentry class who was first elected to Parliament in 1701 and held many senior positions. He was a country squire and looked to country gentlemen for his political base. Historian F. O'Gorman says his leadership in Parliament reflected his "reasonable and persuasive oratory, his ability to move both the emotions as well as the minds of men, and, above all, his extraordinary self-confidence". Julian Hoppit says Walpole's policies sought moderation, he worked for peace, lower taxes and growing exports, and allowed a little more tolerance for Protestant Dissenters. He mostly avoided controversy and high-intensity disputes as his middle way attracted moderates from both the Whig and Tory camps; his appointment to Chancellor of the Exchequer after the South Sea Bubble stock-market crisis drew attention to perceived protection of political allies by Walpole. Historian H. T. Dickinson sums up his historical role by saying that "Walpole was one of the greatest politicians in British history. He played a significant role in sustaining the Whig party, safeguarding the Hanoverian succession, and defending the principles of the Glorious Revolution (1688). He established stable political supremacy for the Whig party and taught succeeding ministers how best to establish an effective working relationship between Crown and Parliament." Some scholars rank him highly among British prime ministers.

Mongkut (18 October 1804 – 1 October 1868), posthumously honoured as King Mongkut the Great was the king of Siam from the Chakri dynasty, titled Rama IV. He reigned from 1851 until his death in 1868. Although the term "Siam" had long been used by foreigners to refer to the kingdom, the title "King of Siam" came to be formally adopted during his reign, particularly in official and diplomatic contexts. The reign of Mongkut was marked by significant modernization initiatives and diplomatic engagements, which played pivotal roles in shaping Siam's trajectory towards progress and international relations. It was during his reign that Siam first felt the pressure of Western expansionism. Mongkut embraced Western innovations and initiated reforms in technology, science, and culture, earning him the posthumous title "the Father of Science and Technology" in Siam. His accurate prediction of the total solar eclipse of 18 August 1868 – later dubbed "the King of Siam's eclipse" – demonstrated his scientific acumen and became a symbol of Siam's engagement with modern science. Mongkut was also known for appointing his younger brother, Prince Chutamani, as Second King, crowned in 1851 as King Pinklao. Mongkut told the country that Pinklao should be respected with equal honor to himself (as King Naresuan had done with his brother Ekathotsarot in 1583). During Mongkut's reign, the power of the House of Bunnag reached its zenith: It became the most powerful noble family of Siam. Mongkut is known in the West primarily through the lens of the 1951 musical The King and I and its 1956 film adaptation, in which he was portrayed by Yul Brynner. Brynner's performance as King Mongkut earned him the Academy Award for Best Actor at the 29th Academy Awards in 1957.

The Pony Express was an American express mail service that used relays of horse-mounted riders between Missouri and California. It was operated by the Central Overland California and Pikes Peak Express Company. During its 18 months of operation beginning in 1860, the Pony Express reduced the time for messages to travel between the east and west US coast to about 10 days. It became the west's most direct means of east–west communication before the first transcontinental telegraph was established (October 24, 1861), and was vital for tying the new state of California with the rest of the United States. Despite a heavy subsidy, the Pony Express was not a financial success and went bankrupt in 18 months, when a faster telegraph service was established. Nevertheless, it demonstrated that a unified transcontinental system of communications could be established and operated year-round. When it was replaced by the telegraph, the Pony Express quickly became romanticized and became part of the lore of the Old West. Its reliance on the ability and endurance of hardy riders and fast horses was seen as evidence of rugged American individualism of the frontier times.

The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States between the Union ("the North") and the Confederacy ("the South"), which was formed in 1861 by states that had seceded from the Union to preserve slavery in the United States. The South saw slavery as threatened because of the election of Abraham Lincoln and the growing abolitionist movement in the North. The war ended with Union victory, the dissolution of the Confederacy and the abolition of slavery, freeing four million African Americans. Decades of controversy over slavery came to a head when Abraham Lincoln, a Republican who opposed slavery's expansion, won the 1860 presidential election. Seven slave states in the South responded to Lincoln's victory by seceding from the United States and forming the Confederate States of America. The Confederacy seized US forts and other federal assets in the South. The war began on April 12, 1861, when the Confederacy bombarded Fort Sumter in South Carolina. A wave of enthusiasm for war swept over the North and South, as military recruitment soared. Four more Southern states seceded after the war began and, led by its president, Jefferson Davis, the Confederacy comprised eleven states, containing a third of the US population. Four years of intense combat, mostly in the South, ensued. During 1861–1862 in the western theater, the Union made permanent gains, though in the eastern theater the conflict was inconclusive. The abolition of slavery became a Union war goal on January 1, 1863, when Lincoln issued the Emancipation Proclamation, which declared all slaves in rebel states to be free, applying to more than 3.5 million of the 4 million enslaved people in the country. To the west, the Union first destroyed the Confederacy's river navy by the summer of 1862, then much of its western armies, and seized New Orleans. The successful 1863 Union siege of Vicksburg split the Confederacy in two at the Mississippi River, while Confederate general Robert E. Lee's incursion north failed at the Battle of Gettysburg. General Ulysses S. Grant's western successes led Lincoln to promote him to command of all Union armies in 1864. Inflicting an ever-tightening naval blockade of Confederate ports, the Union marshaled resources and manpower to attack the Confederacy from all directions. This led to the fall of Atlanta in 1864 to Union general William Tecumseh Sherman, followed by his March to the Sea, which culminated in his taking Savannah. The last significant battles raged around the ten-month siege of Petersburg, gateway to the Confederate capital of Richmond. The Confederates abandoned Richmond, and on April 9, 1865, Lee surrendered to Grant following the Battle of Appomattox Court House, setting in motion the end of the war. Lincoln lived to see this victory but was shot by an assassin on April 14, dying the next day. By the end of the war, much of the South's infrastructure had been destroyed. The Confederacy collapsed, the Thirteenth Amendment abolished slavery, and four million enslaved black people were freed. The war-torn nation then entered the Reconstruction era in an attempt to rebuild the country, bring the former Confederate states back into the United States, and grant civil rights to freed slaves. The war is one of the most extensively studied and written about episodes in the history of the United States. It remains the subject of cultural and historiographical debate. Of continuing interest is the myth of the Lost Cause of the Confederacy. The war was among the first to use industrial warfare. Railroads, the electrical telegraph, steamships, the ironclad warship, and mass-produced weapons were widely used. The war left an estimated 700,000 soldiers dead, along with an undetermined number of civilian deaths, making it the deadliest in American history. The technology and brutality of the Civil War foreshadowed the coming world wars.

The American frontier encompasses the geography, history, folklore, and culture associated with the forward wave of American expansion in mainland North America that began with European colonial settlements in the early 17th century and ended with the admission of the last few contiguous western territories as states in 1912. This era of massive migration and settlement was particularly encouraged by President Thomas Jefferson following the Louisiana Purchase, giving rise to the expansionist attitude known as "manifest destiny" and historians' "Frontier Thesis". The legends, historical events, and folklore of the American frontier, known as the frontier myth, have embedded themselves into United States culture so much so that the Old West, and the Western genre of media specifically, has become one of the defining features of American national identity.

Gottlieb Wilhelm Daimler (German: [ˈɡɔtliːp ˈdaɪmlɐ]; 17 March 1834 – 6 March 1900) was a German engineer, industrial designer and industrialist. He was a pioneer of internal-combustion engines and automobile development. He invented the high-speed liquid petroleum-fueled engine. Daimler and his lifelong business partner Wilhelm Maybach were two inventors whose goal was to create small, high-speed engines to be mounted in any kind of locomotion device. In 1883 they designed a horizontal cylinder layout compressed charge liquid petroleum engine that fulfilled Daimler's desire for a high speed engine which could be throttled, making it useful in transportation applications. This engine was called Daimler's Dream. In 1885 they designed a vertical cylinder version of this engine which they subsequently fitted to a two-wheeler, the first internal combustion motorcycle which was named the Petroleum Reitwagen (Riding Car) and, in the next year, to a coach, and a boat. Daimler called this engine the grandfather clock engine (Standuhr) because of its resemblance to a large pendulum clock. In 1890, they converted their partnership into a stock company Daimler Motoren Gesellschaft (DMG, in English – the Daimler Motors Corporation). They sold their first automobile in 1892. Daimler fell ill and took a break from the business. Upon his return he experienced difficulty with the other stockholders that led to his resignation in 1893. This was reversed in 1894. Maybach resigned at the same time, and also returned. Daimler died in 1900 and Wilhelm Maybach quit DMG in 1907. Daimler is seen as "the father of the motorcycle".

Jack the Ripper was an unidentified serial killer active in and around the impoverished Whitechapel district of the East End of London, in 1888. In both criminal case files and the contemporaneous journalistic accounts, the killer was also called the Whitechapel Murderer and Leather Apron. Attacks ascribed to Jack the Ripper typically involved women working as prostitutes who lived in the slums of the East End of London. Their throats were cut prior to abdominal mutilations. The removal of internal organs from at least three of the victims led to speculation that the killer had some anatomical or surgical knowledge. Rumours that the murders were connected intensified in September and October 1888, and numerous letters were received by media outlets and Scotland Yard from people purporting to be the murderer. The name "Jack the Ripper" originated in the "Dear Boss letter" written by someone claiming to be the murderer, which was disseminated in the press. The letter is widely believed to have been a hoax and may have been written by journalists to heighten interest in the story and increase their newspapers' circulation. Another, the "From Hell letter", was received by George Lusk of the Whitechapel Vigilance Committee and came with half a preserved human kidney, purportedly taken from one of the victims. The public came to believe in the existence of a single serial killer known as Jack the Ripper, mainly because of both the extraordinarily brutal nature of the murders and extensive media coverage of the crimes. Extensive newspaper coverage bestowed enduring international notoriety on the Ripper, and the legend solidified. A police investigation into a series of eleven brutal murders committed in Whitechapel and Spitalfields between 1888 and 1891 was unable to connect all the killings conclusively to the 1888 murders. Five victims – Mary Ann Nichols, Annie Chapman, Elizabeth Stride, Catherine Eddowes and Mary Jane Kelly – are known as the "canonical five", and their murders between 31 August and 9 November 1888 are often considered the most likely to be linked. The murders were never solved, and the legends surrounding these crimes have since become a combination of historical research, folklore and pseudohistory, capturing public imagination to the present day.

Club Atlético Boca Juniors (CABJ) is an Argentine professional sports club based in La Boca, a neighbourhood of Buenos Aires. The club is best known for its men's professional football team which, since its debut in Primera División in 1913, has always played in the top division.

Baron Carl Gustaf Emil Mannerheim was a Finnish military commander and statesman. He served as the military leader of the Whites in the Finnish Civil War (1918), as regent of Finland (1918–1919), as commander-in-chief of the Finnish Defence Forces during World War II (1939–1945), and as the president of Finland (1944–1946). He became Finland's only field marshal in 1933 and was appointed honorary Marshal of Finland in 1942.

Joseph Stalin (born Ioseb Besarionis dze Jughashvili; 18 December 1878 – 5 March 1953) was a Soviet politician and revolutionary who ruled the Soviet Union from the mid-1920s until his death in 1953, holding the titles of General Secretary of the Communist Party of the Soviet Union from 1922 to 1952 and the nation's Premier from 1941 to 1953. Initially presiding over an oligarchic one-party system that governed by plurality, he became the de facto dictator of the Soviet Union by the 1930s. Ideologically committed to the Leninist interpretation of Marxism, Stalin helped to formalise these ideas as Marxism–Leninism, while his own policies became known as Stalinism. Born into a poor Georgian family in Gori, Russian Empire, Stalin began his revolutionary career by joining the Marxist Russian Social Democratic Labour Party as a youth. There, he edited the party's newspaper, Pravda, and raised funds for Vladimir Lenin's Bolshevik faction via robberies, kidnappings, and protection rackets. Repeatedly arrested, he underwent several internal exiles. After the Bolsheviks seized power in Russia during the 1917 October Revolution, Stalin joined the party's governing Politburo, where he was instrumental in overseeing the Soviet Union's establishment in 1922. After Lenin fell ill and then died in 1924, Stalin assumed leadership over the country. During Stalin's rule, "Socialism in One Country" became a central tenet of the party's dogma, and Lenin's New Economic Policy was replaced with a centralized command economy. Under the Five-Year Plan system, the country underwent collectivisation and rapid industrialization but experienced significant disruptions in food production that contributed to the famine of 1932–33. To eradicate those regarded as "enemies of the working class", Stalin instituted the "Great Purge", in which over a million were imprisoned and at least 700,000 executed between 1934 and 1939. Stalin's government promoted Marxism–Leninism abroad through the Communist International and supported anti-fascist movements throughout Europe during the 1930s, particularly in the Spanish Civil War. In 1939, it signed a non-aggression pact with Nazi Germany, resulting in their joint invasion of Poland. Germany ended the pact by invading the Soviet Union in 1941. Despite initial setbacks, the Soviet Red Army repelled the German incursion and captured Berlin in 1945, ending World War II in Europe. The Soviets annexed the Baltic states and helped establish Soviet-aligned governments throughout Central and Eastern Europe, China and North Korea. The Soviet Union and the United States emerged from the war as the two world superpowers. Tensions arose between the Soviet-backed Eastern Bloc and U.S.-backed Western Bloc which became known as the Cold War. Stalin led his country through its post-war reconstruction, during which it developed a nuclear weapon in 1949. In these years, the country experienced another major famine and an antisemitic campaign peaking in the doctors' plot. Stalin died in 1953 and was eventually succeeded by Nikita Khrushchev, who denounced his predecessor and initiated a de-Stalinisation process throughout Soviet society. Widely considered one of the 20th century's most significant figures, Stalin was the subject of a pervasive personality cult within the international Marxist–Leninist movement, for whom Stalin was a champion of socialism and the working class. Since the dissolution of the Soviet Union in 1991, Stalin has retained popularity in Russia as a victorious wartime leader who established the Soviet Union as a major world power. Conversely, his totalitarian government has been widely condemned for overseeing mass repressions, ethnic cleansing, hundreds of thousands of executions, and famines which caused the deaths of millions.

Mount Everest (known in Nepali as Sagarmāthā, in Sherpa as Chamolangma, and in Tibetan as Jomolangma/Čhomolangma is the highest mountain on Earth above sea level. It lies in the Mahalangur Himal sub-range of the Himalayas and marks part of the China–Nepal border at its summit. Its height was most recently measured in 2020 through a joint survey by Nepalese and Chinese authorities as 8,848.86 m.

Bruno Richard Hauptmann (November 26, 1899 – April 3, 1936) was a German-American carpenter and criminal who was convicted of the abduction and murder of Charles Augustus Lindbergh Jr., the 20-month-old son of aviator Charles Lindbergh and his wife Anne Morrow Lindbergh. The Lindbergh kidnapping became known as the "crime of the century". He was executed in 1936 by electric chair at the Trenton State Prison. Both Hauptmann and his wife, Anna Hauptmann, proclaimed his innocence. In recent years, Hauptmann's guilt has been questioned by authors and researchers, and law enforcement behavior in the case has been widely criticized.

World War II, or the Second World War, was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many engaging in total war on an unprecedented scale. World War II was the deadliest conflict in history, causing the deaths of 60 to 75 million people, a majority of whom were civilians. Millions died as a result of massacres, starvation, disease, and genocides including the Holocaust. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.

The Cold War was a period of international geopolitical rivalry between the United States (USA) and the Soviet Union (USSR) and their respective allies, the capitalist Western Bloc and communist Eastern Bloc. It began in the aftermath of the Second World War and ended with the dissolution of the Soviet Union in 1991. The term cold war is used because there was no direct fighting between the two superpowers, though each supported opposing sides in regional conflicts known as proxy wars. In addition to the struggle for ideological and economic influence and an arms race in both conventional and nuclear weapons, the Cold War was expressed through technological rivalries such as the Space Race, espionage, propaganda campaigns, embargoes, and sports diplomacy.

The American Civil Liberties Union (ACLU) is an American nonprofit civil rights organization founded in 1920. ACLU affiliates are active in all 50 states, Washington, D.C., and Puerto Rico. As of 2024, the ACLU's budget is $383 million.

From April 2–3, 1956, a large, deadly tornado outbreak affected the Great Plains, parts of the South, and the upper Midwest in the contiguous United States, especially the Great Lakes region. The outbreak produced at least 55 tornadoes, including an F5 that devastated the Grand Rapids metropolitan area in the U.S. state of Michigan on April 3. It was one of three tornadoes to move across southwest Lower Michigan on that day. A fourth tornado struck north of the Manistee area, in the northern part of the peninsula. The Hudsonville–Standale tornado killed 17 and injured 333. It remains the fourth deadliest tornado on record in Michigan and is the most recent F5 on record there. Several other deadly, intense, long-tracked tornadoes also occurred during the outbreak. In addition to the fatalities in Kansas, Oklahoma, Michigan and Berlin, Wisconsin, three people were killed in Tennessee, one person in Kentucky and two more people in Wisconsin. In total, 39 were killed during the entire event.

LAN-Chile Flight 621 crashed in the Andes on 3 April 1961. All twenty-four people on board were killed, including eight professional footballers and two members of the coaching staff from CD Green Cross. It was Chile's worst ever aviation disaster at the time.

Martin Luther King Jr. (born Michael King Jr.; January 15, 1929 – April 4, 1968) was an American civil rights activist and Baptist minister who was a prominent leader of the civil rights movement from 1955 until his assassination in 1968. He advanced civil rights for people of color in the United States through the use of nonviolent resistance and civil disobedience against Jim Crow laws and other forms of legalized discrimination, which most commonly affected African Americans. A Black church leader, King participated in and led marches for the right to vote, desegregation, labor rights, and other civil rights. He oversaw the 1955 Montgomery bus boycott and was the first president of the Southern Christian Leadership Conference (SCLC), leading the unsuccessful Albany Movement in Albany, Georgia, and helping organize nonviolent 1963 protests in Birmingham, Alabama. King was one of the leaders of the 1963 March on Washington, where he delivered his "I Have a Dream" speech, and helped organize two of the three Selma to Montgomery marches during the 1965 Selma voting rights movement. There were dramatic standoffs with segregationist authorities, who often responded violently. The civil rights movement achieved pivotal legislative gains in the Civil Rights Act of 1964, the Voting Rights Act of 1965, and the Fair Housing Act of 1968. King was jailed several times. Federal Bureau of Investigation (FBI) director J. Edgar Hoover considered King a radical and made him an object of COINTELPRO from 1963. FBI agents investigated him for possible communist ties, spied on his personal life, and secretly recorded him. In 1964, the FBI mailed King a threatening anonymous letter, which he interpreted as an attempt to make him commit suicide. King won the 1964 Nobel Peace Prize for combating racial inequality through nonviolent resistance. In his final years, he expanded his focus to include opposition towards poverty and the Vietnam War. In 1968, King was planning a national occupation of Washington, D.C., to be called the Poor People's Campaign, when he was assassinated on April 4 in Memphis, Tennessee. James Earl Ray was convicted of the assassination, though it remains the subject of conspiracy theories. King's death led to riots in US cities. King was posthumously awarded the Presidential Medal of Freedom in 1977 and Congressional Gold Medal in 2003. Martin Luther King Jr. Day was established as a holiday in cities and states throughout the United States beginning in 1971; the federal holiday was first observed in 1986. The Martin Luther King Jr. Memorial on the National Mall in Washington, D.C., was dedicated in 2011.

The Vietnam War was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam and South Vietnam and their allies. North Vietnam was supported by the Soviet Union and China, while South Vietnam was supported by the United States and other anti-communist nations. The conflict was the second of the Indochina wars and a proxy war of the Cold War. The Vietnam War was one of the postcolonial wars of national liberation, a theater in the Cold War, and a civil war, with civil warfare a defining feature from the outset. Direct US military involvement escalated from 1965 until US forces were withdrawn in 1973. The fighting spilled into the Laotian and Cambodian civil wars, which ended with all three countries becoming communist in 1975.

Martin Cooper (born December 26, 1928) is an American engineer. He is a pioneer in the wireless communications industry, especially in radio spectrum management, with eleven patents in the field. On April 3, 1973, Cooper placed the first public call from a handheld portable cell phone while working at Motorola, from a Manhattan sidewalk to his counterpart at competitor Bell Labs. Cooper reprised the first handheld cellular mobile phone (distinct from the car phone) in 1973 and led the team that redeveloped it and brought it to market in 1983. He is considered the "father of the (handheld) cell phone", and received the 2015 IEEE Masaru Ibuka Consumer Electronics Award for this work. Cooper is co-founder of numerous communications companies with his wife and business partner Arlene Harris; He is co-founder and current Chairman of Dyna LLC, in Del Mar, California. Cooper also sits on committees supporting the U.S. Federal Communications Commission and the United States Department of Commerce. In 2010, Cooper was elected a member of the National Academy of Engineering for leadership in the creation and deployment of the cellular portable hand-held telephone.

The 1974 Super Outbreak was one of the most intense tornado outbreaks on record, occurring on April 3–4, 1974, across much of the United States. It was one of the deadliest tornado outbreaks in U.S. history. It was also the most violent tornado outbreak ever recorded, with 30 violent (F4 or F5 rated) tornadoes confirmed. From April 3–4, there were 149 tornadoes confirmed in 13 U.S. states and the Canadian province of Ontario. In the United States, the tornadoes struck Illinois, Indiana, Michigan, Ohio, Kentucky, Tennessee, Alabama, Mississippi, Georgia, North Carolina, Virginia, West Virginia, and New York. The outbreak caused roughly $600 million USD (equivalent to $3.92 billion in 2025) in damage. The outbreak extensively damaged approximately 900 mi2 (2,331 km2) along a total combined path length of 2,600 mi (4,184 km). At one point, as many as 15 separate tornadoes were occurring simultaneously. The 1974 Super Outbreak was the first tornado outbreak in recorded history to produce more than 100 tornadoes in under a 24-hour period, a feat that was not repeated globally until the 1981 United Kingdom tornado outbreak and in the United States until the 2011 Super Outbreak, the largest outbreak on record by number of tornadoes in a 24-hour period. In 2023, tornado expert Thomas P. Grazulis created the outbreak intensity score (OIS) as a way to rank various tornado outbreaks. The 1974 Super Outbreak received an OIS of 578, making it the most intense tornado outbreak in recorded history.

Operation Babylift was a mass evacuation of children from South Vietnam to the United States and other Western countries at end of the Vietnam War, in April 1975. Over 3,300 infants and children were airlifted, although the actual number has been variously reported.

Robert James Fischer was an American chess grandmaster and the eleventh World Chess Champion. A chess prodigy, he won his first of a record eight US Championships at the age of 14. In 1964, he won with an 11–0 score, the only perfect score in the history of the tournament. Qualifying for the 1972 World Championship, Fischer swept matches with Mark Taimanov and Bent Larsen by 6–0 scores. After winning another qualifying match against Tigran Petrosian, Fischer won the title match against Boris Spassky of the USSR, in Reykjavík, Iceland. Publicized as a Cold War confrontation between the US and USSR, the match attracted more worldwide interest than any chess championship before or since.

The United States Congress is the legislative branch of the federal government of the United States. It is a bicameral legislature, including a lower body, the U.S. House of Representatives, and an upper body, the U.S. Senate. They both meet in the United States Capitol in Washington, D.C.

The Osborne 1 is the first commercially successful portable computer, released on April 3, 1981, by Osborne Computer Corporation. It weighs 24.5 lb (11.1 kg), cost US$1,795, and runs the CP/M 2.2 operating system. It is powered from a wall socket, as it has no on-board battery, but it is still classed as a portable device since it can be hand-carried when the keyboard is closed.

The Supreme Court of the United States (SCOTUS) is the highest court in the federal judiciary of the United States. It has ultimate appellate jurisdiction over all U.S. federal court cases, and over state court cases that turn on questions of U.S. constitutional or federal law. It also has original jurisdiction over a narrow range of cases, specifically "all Cases affecting Ambassadors, other public Ministers and Consuls, and those in which a State shall be Party". In 1803, the court asserted the power of judicial review, the ability to invalidate a statute for violating a provision of the Constitution. It is also able to strike down presidential directives for violating either the Constitution or statutory law.

The Grand National is a National Hunt horse race held annually at Aintree Racecourse in Aintree, Merseyside, England, near Liverpool. First run in 1839 as the Grand Liverpool Steeplechase, it is a handicap steeplechase over 4 miles 2+1⁄2 furlongs, with horses jumping 30 fences over two laps. It is the most valuable jump race in Europe, with a prize fund of £1 million in 2017. An event that is prominent in British culture, the race is popular amongst many people who do not normally watch or bet on horse racing at other times of the year.

Theodore John Kaczynski, also known as the Unabomber, was an American mathematician and domestic terrorist. A mathematics prodigy, he abandoned his academic career in 1969 to pursue a reclusive primitive lifestyle and lone wolf terrorism campaign.

The United States Air Force (USAF) is the air service branch of the United States Armed Forces. It is a part of the United States Department of Defense (DoD) and is one of the six armed forces and one of the eight uniformed services of the United States. Tracing its origins to 1 August 1907, as a part of the United States Army Signal Corps, the Air Force was established by transfer of personnel from the Army Air Forces with the enactment of the National Security Act of 1947. It is the second youngest branch of the United States Armed Forces and the fourth in order of precedence. The United States Air Force articulates its core missions as air supremacy, global integrated intelligence, surveillance and reconnaissance, rapid global mobility, global strike, and command and control.

The Thalit massacre took place in Thalit village, some 70 km from Algiers, on April 3–4, 1997 during the Algerian Civil War. Fifty-two out of the 53 inhabitants were killed by having their throats cut during a 12-hour rampage. The homes of the villagers were burned down afterward. The attack was attributed to "Islamist guerrillas", thought to be affiliated with the Armed Islamic Group.

United States of America v. Microsoft Corporation, 253 F.3d 34, was a landmark American antitrust law case at the United States Court of Appeals for the District of Columbia Circuit. The U.S. government accused Microsoft of illegally monopolizing the web browser market for Windows, primarily through the legal and technical restrictions it put on the abilities of PC manufacturers (OEMs) and users to uninstall Internet Explorer and use other programs such as Netscape and Java.

The TGV holds a series of land speed records for rail vehicles achieved by SNCF, the French national railway, and its industrial partners. The high-speed trials are intended to expand the limits of high-speed rail technology, increasing speed and comfort without compromising safety.

ATA Airlines, Inc., formerly known as American Trans Air and commonly referred to as ATA, was an American low-cost and charter airline based in Indianapolis, Indiana. ATA operated scheduled passenger flights throughout the U.S. mainland and Hawaii, Puerto Rico, and Portugal as well as military and commercial charter flights around the world.

Texas is a state in the United States. It borders the American states of Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, and New Mexico to the west. To the south and southwest, it has an international border with the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas, along a natural boundary formed by the Rio Grande. Texas has a coastline on the Gulf of Mexico to the southeast. Covering 268,596 square miles (695,660 km2) and with an estimated population of over 31.7 million residents in 2025, it is the second-largest U.S. state both by area and by population. Texas is nicknamed the "Lone Star State" for the single star on its flag, symbolic of its former status as an independent country, the Republic of Texas.

Apple Inc. is an American multinational technology company headquartered in Cupertino, California, in Silicon Valley, and known for consumer electronics, software and online services. Founded in 1976 as Apple Computer Company by Steve Jobs, Steve Wozniak and Ronald Wayne, the company was incorporated by Jobs and Wozniak as Apple Computer, Inc. the following year. Its current name was adopted in 2007 as the company expanded its focus from computers to consumer electronics. Apple is one of the Big Tech companies.

The Panama Papers are 11.5 million leaked documents published from April 3, 2016. The papers detail financial and attorney–client information for more than 214,488 offshore entities. These documents, some dating back to the 1970s, were created by, and taken from, the former Panamanian offshore law firm and corporate service provider Mossack Fonseca, and compiled with similar leaks into a searchable database.

On 3 April 2017, a terrorist attack using an explosive device took place on the Saint Petersburg Metro between Sennaya Ploshchad and Tekhnologichesky Institut stations. Eleven people were initially reported to have died, and five more died later from their injuries, bringing the total to 15.

On April 3, 2018, at approximately 12:46 p.m. PDT, a shooting occurred at the headquarters of the American video-sharing website YouTube in San Bruno, California. The shooter was identified as 38-year-old Nasim Najafi Aghdam, who entered through an exterior parking garage, approached an outdoor patio, and opened fire with a Smith & Wesson 9 mm semi-automatic pistol. Aghdam wounded three people, one of them critically, before killing herself with her own firearm.