March 31 wasn’t just another date on the calendar.

It has seen empires crowned, towers rise, landmark laws passed, scientific firsts launched, and voices in art and politics fall silent. Explore how March 31 has quietly threaded itself through turning points in many eras.

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World History1146

Bernard of Clairvaux Preaches the Second Crusade

On March 31, 1146, according to medieval chronicles, the Cistercian abbot Bernard of Clairvaux preached a fiery sermon in Vézelay, France, to launch the Second Crusade. Standing beside King Louis VII, Bernard urged nobles and commoners alike to take the cross and march to the Holy Land after the fall of Edessa. The emotional appeal reportedly led crowds to sew crusader crosses onto their clothing on the spot. Although the crusade itself later faltered, Bernard’s sermon became famous as a powerful example of medieval preaching steering royal policy and public fervor.

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World History1492

Edict of Expulsion Orders Jews from Spain

On March 31, 1492, Spain’s Catholic Monarchs Ferdinand II of Aragon and Isabella I of Castile signed the Alhambra Decree, also known as the Edict of Expulsion. The order gave practicing Jews in their realms a few months to convert to Christianity or leave, tearing apart long-established communities across cities like Toledo, Seville, and Granada. The decree reshaped the religious and cultural landscape of Iberia while scattering Sephardic Jews around the Mediterranean, the Ottoman Empire, and beyond. Its legacy echoed for centuries until Spain formally revoked the edict in the 19th and 20th centuries and later created paths for descendants to reclaim citizenship.

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World History1657

The Humble Petition Offers Cromwell the English Crown

On March 31, 1657, the English Parliament formally presented Oliver Cromwell with the Humble Petition and Advice, a new constitutional framework that, among other powers, offered him the crown. Cromwell, already Lord Protector after the Civil Wars and the execution of Charles I, agonized over the offer, aware that many of his allies had fought to abolish monarchy. After weeks of debate, he ultimately refused the title of king but accepted a revised version of the constitution. The episode exposed the tensions at the heart of the English Republic and foreshadowed the restoration of the monarchy only a few years later.

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World History1889

The Eiffel Tower Opens to the Public

On March 31, 1889, engineer Gustave Eiffel climbed to the top platform of his iron tower in Paris as it was formally completed and opened. Built as the entrance arch for the 1889 Exposition Universelle, the Eiffel Tower became the tallest man-made structure in the world at the time, rising above the city skyline in a lattice of riveted iron. Initial critics dismissed it as an eyesore, but visitors flocked to ride its elevators and gaze over Paris from unprecedented heights. Over time, the tower evolved from a temporary fair structure into one of the world’s most recognizable landmarks and a symbol of French engineering ambition.

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Science & Industry1909

The RMS Titanic Is Launched in Belfast

On March 31, 1909, workers at the Harland & Wolff shipyard in Belfast laid the keel of the RMS Titanic, formally beginning construction on the famously ill-fated liner. The ship was designed as a marvel of early 20th-century engineering, combining luxury interiors with a vast steel hull divided into watertight compartments. Thousands of workers would spend more than two years riveting plates and fitting out the giant vessel before its launch and later sea trials. The Titanic’s tragic sinking in April 1912 would turn this engineering showcase into a sobering case study in maritime safety and human overconfidence in technology.

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U.S. History1917

U.S. Purchases the Danish West Indies (Now the U.S. Virgin Islands)

On March 31, 1917, the United States formally took possession of the Danish West Indies after paying Denmark $25 million in gold, renaming the islands the U.S. Virgin Islands. A transfer ceremony on St. Thomas saw the Danish flag lowered and the Stars and Stripes raised as naval officers and local residents looked on. The purchase reflected U.S. strategic interests in the Caribbean during the World War I era, giving the American navy a key coaling and defense station near the Panama Canal. Over time, the islands would move from naval administration toward civilian government and eventually U.S. territorial citizenship for their inhabitants.

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World History1930

The Motion Picture Production Code Is Adopted

On March 31, 1930, the Motion Picture Producers and Distributors of America officially adopted the Motion Picture Production Code, often called the Hays Code. Drafted under the guidance of Catholic layman Martin Quigley and Jesuit priest Daniel Lord, the code laid out strict rules on screen depictions of sex, crime, religion, and morality. Hollywood studios agreed to abide by the guidelines in response to mounting public and political pressure over film content. Although enforcement tightened only in 1934, the code shaped American movies for three decades, influencing everything from plot endings to how couples could kiss on camera.

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Famous Figures1931

Death of Knut Hamsun, Nobel Laureate Novelist

On March 31, 1952, Norwegian novelist Knut Hamsun, born in 1859, died at the age of 92 after a long and controversial life. Awarded the Nobel Prize in Literature in 1920 for works such as “Growth of the Soil,” Hamsun had been celebrated for his psychological insight and modernist style. His reputation was later deeply tarnished by his support for Nazi Germany, including a notorious obituary praising Adolf Hitler. After the war he faced legal penalties and public condemnation, leaving readers and scholars to wrestle with the tension between his literary achievements and his political choices.

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Science & Industry1943

The Pentagon Announces the Creation of the Jefferson Proving Ground

On March 31, 1943, the U.S. War Department officially activated the Jefferson Proving Ground in Indiana as a major ordnance testing facility. Established in the midst of World War II, the range allowed engineers and soldiers to fire-test artillery shells, bombs, and other munitions under controlled conditions. The site’s thousands of acres of fields and woodlands were transformed into impact areas, firing lines, and observation posts. Data gathered there informed both wartime production and later Cold War weapons development, illustrating how vast landscapes were drafted into the service of industrial-scale warfare research.

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U.S. History1949

Newfoundland Joins Canada as Its Tenth Province

On March 31, 1949, the British dominion of Newfoundland officially entered the Canadian Confederation as the country’s tenth province. The change followed closely contested referendums in which Newfoundlanders debated joining Canada, returning to self-governing dominion status, or maintaining direct rule from Britain. At midnight, flags changed and Ottawa assumed responsibility for the rugged Atlantic territory’s affairs, from fisheries policy to social programs. The union reshaped Canada’s map and brought a distinct maritime culture more firmly into the Canadian national story, even as debates over the choice continued for generations.

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Arts & Culture1959

Dalai Lama Crosses into India After Fleeing Tibet

On March 31, 1959, the 14th Dalai Lama, Tenzin Gyatso, crossed the border into India after a perilous escape from Lhasa following a failed uprising against Chinese rule. His arrival, accompanied by a small entourage of officials and monks, marked the beginning of a large Tibetan exile community that would build monasteries, schools, and cultural institutions in India and beyond. From his base in Dharamshala, the Dalai Lama became a prominent global voice on nonviolence, Buddhism, and cultural preservation. The crossing turned a regional political crisis into a long-running story of diaspora, identity, and spiritual leadership in exile.

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Science & Industry1966

Launch of Luna 10, the First Spacecraft to Orbit the Moon

On March 31, 1966, the Soviet Union launched Luna 10 from the Baikonur Cosmodrome, sending it on a trajectory toward lunar orbit. A few days later, it successfully became the first spacecraft to orbit the Moon, gathering data on lunar gravity fields, radiation, and surface composition. Luna 10 transmitted scientific measurements and even a recording of “The Internationale” during the 23rd Congress of the Communist Party. The mission added another milestone to the space race and expanded humanity’s understanding of the Moon just as NASA was preparing for eventual crewed landings.

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U.S. History1968

Lyndon B. Johnson Declares He Will Not Seek Re‑Election

On the night of March 31, 1968, U.S. President Lyndon B. Johnson shocked television viewers by announcing that he would not seek, and would not accept, his party’s nomination for another term. In a nationally televised address largely devoted to the Vietnam War, Johnson ended with the surprise decision, citing the need to devote himself fully to the search for peace. His withdrawal upended the Democratic primary race, already roiled by antiwar protests and the candidacies of Eugene McCarthy and Robert F. Kennedy. The move symbolized how deeply the Vietnam conflict had shaken American politics and the presidency itself.

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Arts & Culture1969

“Sesame Street” Is Announced to the Public

On March 31, 1969, the Children’s Television Workshop (now Sesame Workshop) held a press conference in New York to announce a new experimental educational show called “Sesame Street.” Backed by the U.S. Office of Education and the Carnegie Corporation, the series was designed to use fast-paced skits, animation, and Muppet characters to teach preschool basics to children, especially in underserved communities. Reporters heard about a fictional urban street where humans and puppets would share songs and lessons on letters, numbers, and social skills. When the show premiered that November, it quickly became a cultural touchstone, its March announcement having quietly heralded a new era in children’s television.

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U.S. History1970

President Nixon Signs the Public Health Cigarette Smoking Act

On March 31, 1970, President Richard Nixon signed the Public Health Cigarette Smoking Act into law, extending warning labels on cigarette packages and banning cigarette advertising on American television and radio. The legislation followed mounting scientific evidence linking smoking to lung cancer and heart disease, as well as a landmark 1964 surgeon general’s report. Tobacco companies scrambled to adjust, pouring more resources into print, billboard, and point-of-sale campaigns before the broadcast ban took effect in 1971. The act marked a turning point in U.S. public health policy and the relationship between advertising, regulation, and consumer risk.

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Famous Figures1980

Assassination of Archbishop Óscar Romero Is Condemned at His Funeral

On March 31, 1980, huge crowds gathered in San Salvador for the funeral of Archbishop Óscar Romero, who had been assassinated a week earlier while saying Mass. Romero had become an outspoken critic of human rights abuses in El Salvador, using his Sunday homilies and radio broadcasts to call for an end to killings and repression. During the funeral outside the cathedral, gunfire and explosions erupted, sending mourners scrambling and causing additional deaths and injuries. The chaotic and violent scene underscored the depth of the country’s crisis and cemented Romero as a symbol of faith-driven resistance; decades later he would be canonized as a saint by the Catholic Church.

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Arts & Culture1986

Mexican Writer Octavio Paz Receives the Miguel de Cervantes Prize

On March 31, 1986, Mexican poet and essayist Octavio Paz received the Miguel de Cervantes Prize in Alcalá de Henares, Spain, the Spanish-speaking world’s most prestigious literary honor. Paz was recognized for works that blended surrealism, political reflection, and explorations of Mexican identity, including “The Labyrinth of Solitude.” The award ceremony linked him symbolically with Miguel de Cervantes, author of “Don Quixote,” and affirmed Latin America’s central place in modern Spanish-language literature. Four years later, Paz would also receive the Nobel Prize in Literature, further amplifying the attention sparked by the Cervantes recognition.

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Inventions1992

Microsoft Releases Windows 3.1

On March 31, 1992, Microsoft released Windows 3.1, a major update to its graphical operating environment for IBM-compatible PCs. The new version introduced TrueType scalable fonts, improved multimedia support, and a more polished user interface, making it easier for everyday users to navigate programs and documents. It quickly sold millions of copies and became the dominant platform for business and home computing in the early 1990s. Windows 3.1’s widespread adoption cemented the desktop metaphor and paved the way for later versions of Windows that would define mainstream personal computing for years.

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Famous Figures1993

Brandon Lee Dies After On‑Set Accident Is Announced

On March 31, 1993, news spread worldwide that actor Brandon Lee, son of martial arts icon Bruce Lee, had died after an on‑set accident the previous day while filming “The Crow” in Wilmington, North Carolina. A mishandled prop gun fired a projectile that fatally wounded the 28‑year‑old during a scene, raising urgent questions about firearms safety in film production. As reports circulated on March 31, fans and industry professionals mourned a rising star whose career had just begun to take off. The tragedy prompted closer scrutiny of prop weapon protocols and remains a reference point in conversations about safety on set.

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Inventions1998

Netscape Releases the Source Code for Its Browser

On March 31, 1998, Netscape Communications publicly released the source code for its Netscape Communicator browser suite, launching what became the Mozilla open-source project. Facing intense competition from Microsoft’s Internet Explorer, Netscape turned to the open-source model in hopes that a global community of developers would help build a better browser. The decision invited programmers around the world to inspect, modify, and improve the code, a radical move for a major commercial software product at the time. From this foundation would eventually emerge the Firefox browser, influencing how software companies thought about collaboration, transparency, and web standards.

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Science & Industry2004

Google Announces Gmail with Unprecedented Storage

On March 31, 2004, Google unveiled Gmail, a web-based email service that promised users a then-astonishing 1 gigabyte of free storage. Announced on what many assumed was an elaborate April Fools’ setup, Gmail introduced threaded conversations, powerful search, and an advertising-supported model tied to message content. The service reframed expectations of email as something you archived and searched rather than constantly deleted to save space. Gmail’s launch helped push competitors toward larger inboxes and more sophisticated interfaces, accelerating the shift from desktop clients to browser-based communication.

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U.S. History2008

U.S. Government Takes Over Bear Stearns in Financial Crisis Deal

On March 31, 2008, as details emerged over a frantic weekend of negotiations, U.S. regulators and JPMorgan Chase finalized an emergency agreement to acquire investment bank Bear Stearns with Federal Reserve backing. Bear Stearns, battered by losses in mortgage-backed securities, had seen its liquidity evaporate earlier in March, sparking fears of broader financial contagion. The deal, supported by a special Fed loan facility, effectively marked one of the earliest major rescues of the unfolding global financial crisis. It signaled that U.S. authorities were willing to intervene aggressively in financial markets, setting precedents for even larger actions later that year.

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Arts & Culture2014

“Frozen” Becomes the Highest‑Grossing Animated Film

On March 31, 2014, box office tallies confirmed that Disney’s “Frozen” had become the highest‑grossing animated film ever released at that time, surpassing previous record holders. The movie’s blend of fairy‑tale storytelling, memorable songs like “Let It Go,” and the sisterly bond between Anna and Elsa had captivated audiences worldwide. Its financial milestone underscored the power of global distribution, merchandising, and repeat viewings, especially among younger fans. The success reshaped Disney’s slate, theme park attractions, and broader strategies around musical animation and franchise building.