Birth of Isabella I of Castile
On April 22, 1451, Isabella of Castile was born in Madrigal de las Altas Torres, Spain. As Queen of Castile and later of a united Spain with her husband Ferdinand II of Aragon, she became a central architect of early modern Europe. Isabella sponsored Christopher Columbus’s 1492 voyage, oversaw the completion of the Reconquista, and supported sweeping religious reforms. Her reign shaped Spanish imperial expansion and set political and religious patterns that endured for centuries across Europe and the Americas.
Pedro Álvares Cabral Reaches the Coast of Brazil
According to Portuguese accounts, on April 22, 1500, navigator Pedro Álvares Cabral’s fleet sighted and landed on the coast of what is now Brazil. Originally aiming for India by rounding Africa, Cabral’s ships were blown far into the Atlantic before making landfall near present-day Porto Seguro. The expedition claimed the territory for the Portuguese Crown, naming it Terra de Vera Cruz, a claim later reinforced by the Treaty of Tordesillas’ division of the Atlantic world. That landfall marked the start of more than three centuries of Portuguese colonial rule in South America.
Treaty of Zaragoza Divides the Eastern Hemisphere
On April 22, 1529, Spain and Portugal signed the Treaty of Zaragoza in the Aragonese city of the same name. Building on the earlier Treaty of Tordesillas, this agreement drew an imaginary line through the eastern hemisphere to settle competing claims over the lucrative Spice Islands in Southeast Asia. Spain effectively ceded its pretensions to the Moluccas in exchange for a large cash payment, while Portugal secured rights in the region. The treaty codified European spheres of influence in Asia and highlighted how oceans and invisible meridians had become tools of imperial power.
Death of James Hargreaves, Inventor of the Spinning Jenny
On April 22, 1778, James Hargreaves died in Nottingham, England. A weaver and carpenter from Lancashire, he is best known for inventing the spinning jenny in the 1760s, a multi-spindle spinning frame that allowed one worker to spin several threads at once. Though he never became wealthy from his idea and faced resistance from hand spinners, his machine helped kick-start the mechanization of the British textile industry. Hargreaves’ life became a symbol of how tinkerers and artisans propelled the Industrial Revolution forward.
U.S. Congress Authorizes the Motto “In God We Trust” on Coins
On April 22, 1864, during the American Civil War, Congress passed an act authorizing the use of the motto “In God We Trust” on certain United States coins. The change followed appeals from citizens and clergy who wanted a reference to divine protection on the nation’s currency at a moment of national crisis. The phrase first appeared that year on the two-cent piece and later spread to other coins and eventually paper money. Over time, the motto became a recurring focal point in debates about religion, identity, and public life in the United States.
The Oklahoma Land Run Opens the “Unassigned Lands”
At high noon on April 22, 1889, a cannon blast signaled the start of the Oklahoma Land Run, opening the so-called “Unassigned Lands” to non-Native settlement. Tens of thousands of settlers on horseback, in wagons, and even on foot surged across the prairie to stake claims on homesteads. The chaotic rush led to instant towns like Oklahoma City, which went from empty prairie to a bustling tent city in a single day. The event accelerated the dispossession of Indigenous peoples in the region and helped push the Oklahoma Territory toward eventual statehood.
First Large-Scale Poison Gas Attack at Ypres
On the evening of April 22, 1915, German forces released clouds of chlorine gas against Allied trenches near Ypres, Belgium, during the Second Battle of Ypres. Witnesses described a greenish-yellow mist rolling across no man’s land, followed by choking, panic, and desperate improvisation of makeshift masks. The attack inflicted severe casualties on French and colonial troops and opened a dangerous gap in the Allied line, though the Germans failed to fully exploit it. The episode marked a grim escalation in World War I and spurred rapid development of gas masks, chemical weapons, and international efforts to ban them.
Easter Rising Erupts in Dublin
On April 22, 1916, as Easter weekend approached, Irish republicans in the Irish Republican Brotherhood confirmed their plans for an uprising that would begin two days later, on Easter Monday, April 24. That Saturday saw orders, counter-orders, and tense meetings after a vital arms shipment was lost off the coast of County Kerry. The confusion led to postponements and mixed signals that shaped who ultimately took up arms in Dublin and beyond. The events of that weekend fed directly into the Easter Rising, a brief but pivotal insurrection against British rule that energized the cause of Irish independence.
London Naval Treaty Signed to Limit Warships
On April 22, 1930, delegates from the United States, Britain, Japan, France, and Italy signed the London Naval Treaty. Building on the earlier Washington Naval Treaty, it aimed to prevent a costly naval arms race by imposing limits on cruiser, destroyer, and submarine tonnage. Negotiations reflected shifting alliances, strategic anxieties, and Japanese demands for parity with Western powers. While later undermined by rising militarism in the 1930s, the treaty captured an interwar moment when governments still hoped to regulate warfare through carefully measured ship counts and international law.
Birth of Actor Jack Nicholson
Jack Nicholson was born on April 22, 1937, in Neptune City, New Jersey. After early work in low-budget films, he broke through with his role in “Easy Rider” and became one of American cinema’s most recognizable faces. Performances in “One Flew Over the Cuckoo’s Nest,” “Chinatown,” and “The Shining” showcased his mix of intensity, irony, and charisma. Over decades, Nicholson’s characters helped define modern screen antiheroes and made him an enduring figure in Hollywood lore.
Hitler Remains in Berlin as Soviet Forces Encircle the City
On April 22, 1945, with Soviet troops closing in on central Berlin, Adolf Hitler held a tense military conference in his bunker beneath the Reich Chancellery. Confronted with the collapse of his armies, he reportedly raged at his generals and briefly declared that the war was lost before insisting he would stay in Berlin rather than flee south. Orders and counter-orders issued that day deepened the chaos among German forces still fighting in and around the capital. The date stands out as the moment when Nazi leadership effectively retreated into the bunker, setting the stage for the final days of the Third Reich.
Army–McCarthy Hearings Open in Washington
On April 22, 1954, the U.S. Senate’s televised Army–McCarthy hearings began in Washington, D.C. Senator Joseph McCarthy faced accusations that he and his staff had pressured the U.S. Army to give special treatment to a former aide, while he continued his aggressive campaign alleging communist infiltration. Millions of Americans watched the proceedings, seeing McCarthy challenged in real time by Army counsel Joseph Welch and others. The hearings badly damaged McCarthy’s public image and helped turn the tide against the most extreme forms of postwar anticommunist crusading.
New York World’s Fair Opens in Flushing Meadows
On April 22, 1964, the New York World’s Fair opened its gates at Flushing Meadows–Corona Park in Queens. Pavilions from corporations, U.S. states, and countries around the globe invited visitors to tour gleaming visions of the “World of Tomorrow,” complete with picture phones, color televisions, and animatronic attractions. Iconic features like the Unisphere, a giant stainless-steel globe, became lasting symbols of both mid-century optimism and the growing sense of a connected planet. The fair left a cultural imprint that stretched from theme-park design to how Americans imagined technology and the future.
First Solo Nonstop Circumnavigation of the Globe Completed
On April 22, 1969, British sailor Robin Knox-Johnston sailed his yacht Suhaili back into Falmouth, England, becoming the first person to sail solo nonstop around the world. He had set out the previous year as a competitor in the Sunday Times Golden Globe Race, facing towering seas, equipment failures, and months of isolation. While other entrants dropped out or were lost, Knox-Johnston pressed on, completing the roughly 30,000-mile journey without setting foot on land. His feat expanded the horizons of ocean voyaging and inspired later generations of long-distance sailors and adventurers.
First Earth Day Mobilizes Millions for the Environment
On April 22, 1970, an estimated millions of people across the United States took part in the first Earth Day. Organized by Senator Gaylord Nelson and activist Denis Hayes, the day featured teach-ins, marches, and clean-up events on campuses and in cities from coast to coast. Protesters highlighted smog, oil spills, polluted rivers, and the disappearance of wildlife, linking environmental damage to public health and social justice. The momentum from that day helped spur the creation of the U.S. Environmental Protection Agency and landmark laws like the Clean Air Act and Clean Water Act, and Earth Day soon spread to countries worldwide.
Israel Wins Eurovision with “A-Ba-Ni-Bi”
On April 22, 1978, the Eurovision Song Contest final took place in Paris, where Israel’s entry “A-Ba-Ni-Bi,” performed by Izhar Cohen and the Alphabeta, took first place. The catchy song, sung in Hebrew and built around a playful children’s language, stood out in a field of more conventional love ballads. Its victory marked Israel’s first Eurovision win and brought broader international attention to the country’s pop music scene. The performance helped cement Eurovision’s reputation as a showcase not only for music, but for national style, language, and identity on a glittering stage.
Bob Marley’s “One Love Peace Concert” in Kingston
Also on April 22, 1978, the One Love Peace Concert took place at the National Stadium in Kingston, Jamaica. Bob Marley, returning to Jamaica after surviving an assassination attempt, shared the stage with other reggae stars in a show intended to ease violent political tensions on the island. In a now-famous moment, he invited rival political leaders Michael Manley and Edward Seaga onstage and raised their hands together before the crowd. While it did not end Jamaica’s troubles, the concert became a powerful cultural symbol of music’s role in calling for unity and peace.
Gas Explosions Devastate Guadalajara’s Sewer System
On April 22, 1992, a series of powerful gasoline explosions ripped through sewer lines in Guadalajara, Mexico. The blasts tore open streets for kilometers, destroying homes and businesses and causing significant loss of life. Investigations later pointed to fuel leaks from a petroleum company’s pipeline and inadequate monitoring of volatile fumes in the drainage system. The disaster prompted scrutiny of urban infrastructure safety in Mexico and highlighted the risks that can lurk beneath modern cities’ paved surfaces.
Death of Former U.S. President Richard Nixon
Richard Nixon died on April 22, 1994, in New York City at the age of 81, four days after suffering a stroke. As the 37th president of the United States, he had overseen significant initiatives such as opening diplomatic relations with the People’s Republic of China, signing arms control agreements with the Soviet Union, and establishing the Environmental Protection Agency. His presidency, however, ended in resignation in 1974 amid the Watergate scandal and related abuses of power. In the years after leaving office, Nixon worked to rehabilitate his reputation through books and foreign policy commentary, leaving a complex and debated legacy.
Deepwater Horizon Drilling Rig Sinks in the Gulf of Mexico
On April 22, 2010, two days after a deadly explosion and fire, the offshore drilling rig Deepwater Horizon sank in the Gulf of Mexico. As the damaged wellhead remained uncapped nearly 5,000 feet below the surface, oil began gushing into the sea in what would become one of the largest marine oil spills on record. The sinking focused global attention on the risks of deepwater drilling, emergency preparedness, and corporate oversight in the energy industry. Years of cleanup efforts, legal cases, and policy debates followed, reshaping regulation of offshore oil operations in the United States and beyond.
Countries Sign the Paris Climate Agreement at the U.N.
On April 22, 2016, representatives of more than 170 countries gathered at United Nations headquarters in New York to sign the Paris Agreement on climate change. The ceremony, timed deliberately to coincide with Earth Day, followed negotiations in Paris the previous December that had produced a framework for limiting global temperature rise. Leaders and envoys queued to sign the accord, pledging to submit national plans to cut greenhouse gas emissions and to strengthen those commitments over time. The signing underscored both the scale of the climate challenge and the emerging sense of shared responsibility for addressing it.
NASA’s Ingenuity Helicopter Makes Its Second Flight on Mars
On April 22, 2021, NASA’s Ingenuity helicopter completed its second powered flight in the thin atmosphere of Mars. The small craft rose higher and flew sideways a short distance, surpassing the cautious first hop made three days earlier. Engineers on Earth watched data trickle back, confirming that solar charging, autonomous navigation, and rotor dynamics were all working on another planet. Though designed as a technology demonstration, Ingenuity’s continued success encouraged mission planners to imagine fleets of flying scouts accompanying future Mars rovers.