March 31 in History

Minervina was either the first wife or concubine of Constantine I, and the mother of his eldest son and future caesar Crispus. Little is known of her life. Her birth and death dates are unknown.

Bernard of Clairvaux, O.Cist., venerated as Saint Bernard, was an abbot, mystic, co-founder of the Knights Templar, and a major leader in the reform of the Benedictines through the nascent Cistercian Order.

In 1173–1174, a conspiracy took place in Cairo in favour of restoring the Isma'ili Shi'a Fatimid Caliphate, which had been abolished in 1171 by Saladin, the first Ayyubid ruler of Egypt. The conspiracy, which is known only from sources favourable to Saladin, was led by elites of the fallen Fatimid regime, and aimed to seize control over Cairo by taking advantage of Saladin's absence from the city on campaign. To this end, they are alleged to have contacted the Crusaders of the Kingdom of Jerusalem, inviting them to invade Egypt in order to lure Saladin away. The conspirators are also said to have contacted the Nizari Isma'ili Order of Assassins to assassinate Saladin. The veracity of these claims is disputed by modern historians, who consider them inventions aimed to discredit the conspirators. In the event, the conspiracy was betrayed to Saladin, although the sources differ on how exactly. Some even hold that the conspiracy was precipitated by Saladin as a political purge, or as a means of demonstrating to his increasingly hostile nominal master, the emir of Aleppo and Damascus, Nur al-Din Zengi, that Egypt was still unruly and that Saladin was indispensable to keep the opposition in check. The Ayyubid ruler struck on 31 March 1174 and arrested the ringleaders, among them the celebrated poet Umara al-Yamani. The chief conspirators were executed at the Bayn al-Qasrayn square from 6 April until 23 May, while others were exiled. A pro-Fatimid revolt in Upper Egypt followed, but was suppressed in September by Saladin's brother, al-Adil.

Pope Gregory X (Latin: Gregorius X; born Teobaldo Visconti; c. 1210 – 10 January 1276) was head of the Catholic Church and ruler of the Papal States from 1 September 1271 to his death and was a member of the Third Order of St. Francis. He was elected at the conclusion of a papal election that ran from 1268 to 1271, the longest papal election in the history of the Catholic Church. He convened the Second Council of Lyon and also made new regulations in regards to the papal conclave. Gregory was beatified by Pope Clement XI in 1713 after the confirmation of his cultus. Gregory's regulations on the conduct of the conclave, though briefly annulled by Adrian V and John XXI, remained standard practice until the 20th century. Gregory's rules were dispensed in certain extraordinary circumstances, offering greater latitude in regulating an upcoming conclave, such as by Pope Pius VI in 1798, in consideration of the occupation of Rome by the French, and by Pope Pius IX in 1878, fearing a potential Vatican invasion could prevent or dominate a papal election.

Ferdinand II (10 March 1452 – 23 January 1516), also known as Ferdinand the Catholic (Spanish: Fernando el Católico), was King of Aragon from 1479 until his death in 1516. As the husband and co-ruler of Queen Isabella I of Castile, he was also King of Castile from 1475 to 1504 (as Ferdinand V). He reigned jointly with Isabella over a dynastically unified Spain; together, they are known as the Catholic Monarchs. Ferdinand is considered the de facto first king of Spain, and was described as such during his reign, even though, legally, Castile and Aragon remained two separate kingdoms until they were formally united by the Nueva Planta decrees issued between 1707 and 1716. The Crown of Aragon that Ferdinand inherited in 1479 included the kingdoms of Aragon, Valencia, Mallorca, Sardinia, and Sicily, as well as the Principality of Catalonia. His marriage to Isabella is regarded as the "cornerstone in the foundation of the Spanish monarchy". They played a major role in the European colonization of the Americas, sponsoring the first voyage of Christopher Columbus in 1492. That year, the couple defeated Granada, the last Muslim state in Western Europe, thus completing the centuries-long Reconquista. Following Isabella's death in 1504, the couple's daughter Joanna became queen of the Crown of Castile. That year, after a war with France, Ferdinand conquered the Kingdom of Naples. In 1507, he became regent of Castile on behalf of Joanna, who was alleged to be mentally unstable. In 1506, as part of a treaty with France, Ferdinand married Germaine of Foix, with whom he had no surviving children. In 1512, he conquered most of the Kingdom of Navarre, ruling all the territories comprising modern-day Spain until his death in 1516. He was nominally succeeded by his daughter Joanna, but power was soon assumed by her son Charles I (later Holy Roman Emperor Charles V).

Ferdinand Magellan (c. 1480 – 27 April 1521) was a Portuguese explorer best known for planning and leading the 1519–1522 Spanish expedition to the East Indies. During this expedition, he became the first European to encounter the Strait of Magellan, performed the first European crossing of the Pacific Ocean, and made the first known European contact with the Philippines. Magellan was killed in battle in the Philippines in 1521, but his crew, commanded by Spanish navigator Juan Sebastián Elcano, completed the return trip to Spain in 1522, achieving the first circumnavigation of Earth in history. Born around 1480 into a family of minor Portuguese nobility, Magellan became a skilled sailor and naval officer in the service of the Portuguese Crown in Asia. However, King Manuel I refused to support Magellan's plan to reach the Moluccas, or Spice Islands, by sailing westwards around the American continent. Magellan then proposed the same plan to King Charles I of Spain, who approved it. In Seville, he married, fathered two children, and organized the expedition. In 1518, for his allegiance to the Hispanic monarchy, Magellan was appointed an admiral of the Spanish fleet and given command of the expedition—the five-ship "Armada of Molucca". He also was made a Commander of the Order of Santiago, one of the highest military ranks of the Spanish Empire. Granted special powers and privileges by the king, he led the Armada from Sanlúcar de Barrameda southwest across the Atlantic Ocean, to the eastern coast of South America, and south to Patagonia. Despite a series of storms and mutinies, the expedition successfully passed through the Strait of Magellan into the Mar del Sur, which Magellan renamed the Mar Pacifico, or Pacific Ocean. The expedition landed at Guam after an arduous crossing of the Pacific, then reached the Philippines. There, on 27 April 1521, Magellan died in the Battle of Mactan after being shot in the neck with a poison arrow. Under the command of Captain Juan Sebastián Elcano, the expedition finally reached the Spice Islands. The fleet's two remaining ships then parted ways, one attempting, unsuccessfully, to reach New Spain by sailing east across the Pacific. The other ship, commanded by Elcano, sailed west across the Indian Ocean and north along the Atlantic coast of Africa, finally returning to Spain in September 1522. While in the Kingdom of Portugal's service, Magellan had already reached the Malay Archipelago in Southeast Asia on previous voyages traveling east (from 1505 to 1511–1512). By visiting this area again but now traveling west, Magellan achieved a nearly complete personal circumnavigation of the globe for the first time in history.

The Long Parliament was an English Parliament which nominally lasted from 1640 until 1660, making it the longest-lasting Parliament in English and British history. It followed the fiasco of the Short Parliament, which had convened for only three weeks during the spring of 1640 after an 11-year parliamentary absence. In September 1640, King Charles I issued writs summoning a parliament to convene on 3 November 1640. He intended it to pass financial bills, a step made necessary by the costs of the Bishops' Wars against Scotland. The Long Parliament received its name from the fact that, by an act of Parliament, the Parliament Act 1640, it stipulated it could be dissolved only with agreement of the members; and those members did not agree to its dissolution until 16 March 1660, after the English Civil War and near the close of the Interregnum.

The Catalan Courts or General Court of Catalonia (Catalan: Corts Catalanes or Cort General de Catalunya) were the parliamentary body of the Principality of Catalonia from the 13th to the 18th century. The Catalan Courts were the result of the territorial and institutional evolution of the Comital Court of Barcelona (council of the count of Barcelona), and took its definitive institutional form in 1283, according to historian Thomas Bisson. Composed by the king and the three estates of the realm, it has been considered by several historians as a model of medieval parliament. Scholar Charles Howard McIlwain wrote that the General Court of Catalonia had a better defined organization than the parliaments of England or France. Unlike the Courts of Castile, which at the time functioned mainly as an advisory body to which the king granted privileges and exemptions, the Catalan Courts was a regulatory body, as their decisions had the force of law, in the sense that the king could not unilaterally revoke them, being the first parliament of Europe that officially obtained the power to pass legislation, alongside the monarch. It is comparable to similar institutions across Europe, such as the Parliament of England and the diets of the German lands. The General Courts of the Crown of Aragon were the simultaneous meeting of the Courts of Aragon, the Courts of Valencia and the Courts of Catalonia. The Kingdom of Majorca did not convene Courts and thus sent their representatives to the Courts of the Principality. As the courts could not be held outside of Aragon nor the Principality, they were frequently held in Monzón or in Fraga, both claimed by Aragon and Catalonia due to their location on the eastern bank of the Cinca river. The Catalan Courts met for almost five centuries, until they were abolished by the Nueva Planta decrees of 1716. Thereafter the Courts of Castile operate as the unified Courts of Spain, except in Navarra. Despite some attempts to reestablish the Courts, Catalonia only recovered a legislative assembly in 1932, in the form of the current Parliament of Catalonia.

Benjamin Hoadly (14 November 1676 – 17 April 1761) was an English clergyman, who was successively Bishop of Bangor, of Hereford, of Salisbury, and finally of Winchester. He is best known as the initiator of the Bangorian Controversy.

The American Revolution (1765–1789) was a political movement in the Thirteen Colonies of Great Britain. It began as a rebellion and turned into a revolution eventually creating the sovereign United States, which was the outcome of the associated American Revolutionary War (1775–1783). The Second Continental Congress, as the provisional government, established the Continental Army and appointed George Washington as its commander-in-chief in 1775. The following year, the Congress passed the Lee Resolution on July 2nd and unanimously adopted the Declaration of Independence on July 4th. Throughout most of the war, the outcome appeared uncertain, but a 1781 victory by Washington and the Continental Army in the Siege of Yorktown led King George III and the Fox–North coalition in government to negotiate the cessation of colonial rule and the acknowledgment of American sovereignty, which was formalized in the Treaty of Paris, signed on September 3, 1783. The Constitution took effect in 1789 and the Bill of Rights was ratified in 1791. Discontent with colonial rule began shortly after the French and Indian War, which ended in 1763. Although the colonies had fought and supported the war directly, the British Parliament imposed new taxes, ostensibly to compensate for wartime costs, and transferred control of the colonies' western lands to British officials in Montreal. Representatives from several colonies convened in New York City for the Stamp Act Congress in 1765. Its declaration argued that taxation without representation and other policies violated their rights as Englishmen. In 1767, though the Stamp Act was repealed, tensions increased again following Parliament's passing of the Townshend Acts. In an effort to quell the mounting rebellion, King George III deployed British troops to the colony of Massachusetts, where there was a conflict in the 1770 Boston Massacre. In December 1773, the local faction of the Sons of Liberty orchestrated the Boston Tea Party, during which they dumped chests of taxed tea owned by the British East India Company into the Boston Harbor. Parliament responded by enacting a series of punitive laws, called the Intolerable Acts. These were intended to end self-government in Massachusetts but instead increased American support for revolution. In 1774, 12 of the Thirteen Colonies sent delegates to the First Continental Congress (the Province of Georgia joined in 1775). The First Continental Congress began coordinating Patriot resistance through underground networks of committees largely built on the foundations of the Sons of Liberty network. In August 1775, King George III proclaimed Massachusetts to be in rebellion. The British attempted to disarm the colonists, resulting in the Battles of Lexington and Concord, starting the Revolutionary War. The Second Continental Congress convened in May of 1775 and created the Continental Army, which then surrounded Boston, forcing the British to withdraw by sea in March 1776 and leaving Patriots in control in every colony. In May 1776, Congress voted to suppress all forms of Crown authority to be replaced by locally created authority, and each colony created a state constitution. On July 2, the Congress passed the Lee Resolution, affirming their support for joint independence. On July 4, 1776, they unanimously adopted the Declaration of Independence, proclaiming that "all men are created equal". After that, Congress began drafting the Articles of Confederation, an effort to establish a multi-state self-governing coordinating body capable of negotiating international treaties and prosecuting the war. The Revolutionary War continued for another seven years, during which France eventually entered. On September 28, 1781, Washington commanded the Continental Army's capture of a British army under General Cornwallis at the Siege of Yorktown, leading to the collapse of King George's control of Parliament. Consensus in Parliament soon shifted to the war ending on American terms. On September 3, 1783, the British signed the Treaty of Paris, recognizing the sovereign independence of the United States, and ceding to the new nation nearly all the territory east of the Mississippi River and south of the Great Lakes. The United States became the first nation to establish a federal republic with a written constitution based on the principles of universal natural rights, consent of the governed, and equality under the law, although with significant democratic limitations compared to later evolution of the concept.

The War of the Sixth Coalition (French: Guerre de la Sixième Coalition; December 1812 – May 1814), sometimes known in Germany as the Wars of Liberation (German: Befreiungskriege) saw a coalition of Austria, Prussia, Russia, Spain, the United Kingdom, Portugal, Sweden, Sardinia, and a number of German states defeat the First French Empire and force Napoleon into exile on Elba. Following the disastrous French invasion of Russia in 1812 in which they had been forced to support France, Prussia and Austria joined Russia, Britain, Sweden, Portugal and Spain against France. The invasion of Russia cost the French many seasoned soldiers, so Napoleon took action to engage "Marie-Louises", young conscripts who were barely familiar with military affairs; they were called up from October 1813 to 1815. However, the constant warfare weakened the Coalition nations as well. The Russian military was particularly depleted after 1812, and Prussia also suffered a significant downgrade as a result of its losses in 1806–1807; nevertheless, it carried out large-scale reforms to improve the situation in the Prussian Army. Later, having encountered the Prussians in the Battle of Lützen, Napoleon would say: "These animals have learned something." The war saw battles at Lützen, Bautzen, and Dresden. The even larger Battle of Leipzig was the largest battle fought in Europe until World War II. Despite experiencing a collapse in the army following the invasion of Russia, Napoleon managed to reorganise and stall the coalition, driving them out of Germany and compelling them to accept a truce. With their armies reorganized, the allies drove Napoleon out of Germany in 1813 and invaded France in 1814. Though it had experienced a second collapse after the battle of Leipzig, the French army managed to regroup and Napoleon struck the allies at the Battle of Brienne and the Battle of Saint-Dizier before his defeat at the Battle of La Rothiere, which motivated the coalition to march on Paris as they sensed Napoleon growing weaker. Napoleon then inflicted a series of successive defeats on the allies interrupted only by the (Battle of Laon), beginning with the Six Days' Campaign. After that, Napoleon launched an offensive against the army of Bohemia, driving them past Troyes. Following Marshal Marmont's pushing back of a second attempt by Prussia to march on Paris, Napoleon followed it up with the Battle of Craonne and the Battle of Reims, then driving back the Army of Bohemia until he lost momentum during the Battle of Arcis-sur-Aube where he was severely outnumbered. The Allies eventually overcame the French armies, occupied Paris after a stiff battle and forced Napoleon's first abdication in April 1814. Napoleon was exiled and the French monarchy was restored by the allies in the Bourbon Restoration. The Hundred Days began in 1815 when Napoleon escaped from his captivity on Elba and returned to power in France. He was defeated again for the final time at Waterloo, ending the Napoleonic Wars.

The United Kingdom of Great Britain and Ireland was established by the Acts of Union in 1801 that united the Kingdom of Great Britain and the Kingdom of Ireland into one unitary and sovereign state. It continued in this form until 1922, after the Irish Free State gained independence, with the remainder continuing as the United Kingdom of Great Britain and Northern Ireland.

The Eiffel Tower ( EYE-fəl; French: Tour Eiffel [tuʁ ɛfɛl] ) is a lattice tower on the Champ de Mars in Paris, France. It is named after the engineer Gustave Eiffel, whose company designed and built the tower from 1887 to 1889. Locally nicknamed "La dame de fer" (French for "Iron Lady") for its use of wrought iron, it was constructed as the centrepiece of the 1889 World's Fair, and to crown the centennial anniversary of the French Revolution. Although initially criticised by some of France's leading artists and intellectuals for its design, it has since become a global cultural icon of France and one of the most recognisable structures in the world. The tower received 5,889,000 visitors in 2022. The Eiffel Tower is the most visited monument with an entrance fee in the world: 6.91 million people ascended it in 2015. It was designated a monument historique in 1964, and was named part of a UNESCO World Heritage Site ("Paris, Banks of the Seine") in 1991. The tower is 330 metres (1,083 ft) tall, about the same height as an 81-storey building, and the tallest structure in Paris. Its base is square, measuring 125 metres (410 ft) on each side. During its construction, the Eiffel Tower surpassed the Washington Monument to become by far the tallest human-made structure in the world, a title it held for 41 years until the Chrysler Building in New York City was finished in 1930. It was the first structure in the world to surpass both the 200-metre and 300-metre mark in height. Due to the addition of a broadcasting aerial at the top of the tower in 1957, it is now taller than the Chrysler Building by 11 metres (36 ft). Excluding transmitters, the Eiffel Tower is the second tallest free-standing structure in France after the Millau Viaduct. The tower has three levels for visitors, with restaurants on the first and second levels. The top level's upper platform is 276 m (906 ft) above the ground—the highest public observation deck in the European Union. Tickets can be purchased to ascend by stairs or lift to the first and second levels. The climb from ground level to the first level is over 300 steps, as is the climb from the first level to the second, making the entire ascent a 600-step climb. Although there is a staircase to the top level, it is usually accessible only by lift. On this top, third level, is a private apartment built for Gustave Eiffel, who decorated it with furniture made by Jean Lachaise and invited friends such as Thomas Edison.

The Philippine–American War, known alternatively as the Filipino–American War, Philippine Insurrection, or Tagalog Insurgency, emerged in early 1899 following the United States' annexation of the former Spanish colony of the Philippine Islands under the terms of the December 1898 Treaty of Paris following the Spanish–American War. Philippine nationalists had proclaimed independence in June 1898 and constituted the First Philippine Republic in January 1899. The United States did not recognize either event as legitimate, and tensions escalated until fighting commenced on February 4, 1899, in the Battle of Manila. Shortly after being denied a request for an armistice, the Philippine government issued a proclamation on June 2, 1899, urging the people to continue the war. Philippine forces initially attempted to engage U.S. forces conventionally but transitioned to guerrilla tactics by November 1899. Philippine President Emilio Aguinaldo was captured on March 23, 1901, and the war was officially declared over by the US on July 4, 1902. However, some Philippine groups continued to fight for several more years. Other groups, such as the Muslim Moro peoples of the southern Philippines and quasi-Catholic Pulahan religious movements, continued hostilities in remote areas. The Moro Rebellion ended with their final defeat at the Battle of Bud Bagsak on June 15, 1913. The war resulted in at least 200,000 Filipino civilian deaths, mostly from famine and diseases, including at least 150,000 deaths in a cholera epidemic towards the end of the war. Some estimates for civilian deaths reach up to a million. War crimes were committed during the conflict by both sides. In retaliation for Filipino guerrilla warfare tactics, the U.S. carried out reprisals and scorched earth campaigns and forcibly relocated many Filipino civilians to concentration camps, where thousands of them died. The war and subsequent occupation by the U.S. changed the culture of the islands, leading to the rise of Protestantism, disestablishment of the Catholic Church, and the adoption of English by the islands as the primary language of government, education, business, and industry. The U.S. annexation and war sparked a political backlash from anti-imperialists in the U.S. Senate, who argued that the war was a definite example of U.S. imperialism, and that it was an inherent contradiction of the founding principles of the United States contained in the Declaration of Independence. In 1902, the United States Congress passed the Philippine Organic Act, which created the Philippine Assembly. This act was superseded by the 1916 Jones Act (Philippine Autonomy Act), which contained the first official declaration of the United States government's commitment to eventually grant independence to the Philippines. The 1934 Tydings–McDuffie Act created the Commonwealth of the Philippines, increased self-governance and established a process towards full independence. This would however be delayed by World War II and the Japanese occupation of the Philippines. The United States eventually withdrew and granted independence in 1946 through the Treaty of Manila.

Rusalka (pronounced [ˈrusalka] ), Op. 114, is an opera ('lyric fairy tale') by Antonín Dvořák. His ninth opera (1900–1901), it became his most successful, frequenting the standard repertoire worldwide. Jaroslav Kvapil wrote the libretto on Karel Jaromír Erben's and Božena Němcová's fairy tales. The rusalka is a water sprite from Slavic mythology; it usually inhabits a lake or river. For many years unfamiliarity with Dvořák's operas outside the Czech lands helped reinforce a perception that composition of operas was a marginal activity, and that despite the beauty of its melodies and orchestral timbres Rusalka was not a central part of his output or of international lyric theatre. In recent years it has been performed more regularly by major opera companies. It is performed by opera companies worldwide far more than all of Dvořák's other operas combined. The most popular excerpt from Rusalka is the soprano aria, the "Song to the Moon" ("Měsíčku na nebi hlubokém") for the title character in act 1, which is often performed in concert and recorded separately. It has also been arranged for violin and used on film soundtracks.

The National Collegiate Athletic Association (NCAA) is a nonprofit organization that regulates student athletics among about 1,100 schools in the United States, and 1 in Canada. It also organizes the athletic programs of colleges and helps over 500,000 college student athletes who compete annually in college sports. The headquarters is located in Indianapolis, Indiana.

The Bosnian Crisis, also known as the Annexation Crisis or the First Balkan Crisis, erupted on 5 October 1908 when Austria-Hungary announced the annexation of Bosnia and Herzegovina, territories formerly within the sovereignty of the Ottoman Empire but under Austro-Hungarian administration since 1878.

In music, modernism is an aesthetic stance underlying the period of change and development in musical language that occurred around the turn of the 20th century, a period of diverse reactions in challenging and reinterpreting older categories of music, innovations that led to new ways of organizing and approaching aspects of music such as harmony, melody, sound, and rhythm, and changes in aesthetic worldviews in close relation to the larger identifiable period of modernism in the arts of the time. The operative word most associated with it is "innovation". Its leading feature is a "linguistic plurality", which is to say that no one musical language, or modernist style, ever assumed a dominant position.Inherent within musical modernism is the conviction that music is not a static phenomenon defined by timeless truths and classical principles, but rather something which is intrinsically historical and developmental. While belief in musical progress or in the principle of innovation is not new or unique to modernism, such values are particularly important within modernist aesthetic stances.

The Treaty of the Danish West Indies, officially the Convention between the United States and Denmark for cession of the Danish West Indies, was a 1916 treaty transferring sovereignty of the Danish West Indies from Denmark to the United States in exchange for a sum of US$25,000,000 in gold, and agreement to cede US interest in Greenland. It is one of the most recent permanent expansions of United States territory.

The March Days or March Events (Azerbaijani: Mart hadisələri) was a period of inter-ethnic strife and clashes which took place between 30 March – 2 April 1918 in the city of Baku and adjacent areas of the Baku Governorate of the Transcaucasian Commissariat. Facilitated by a political power struggle between Bolsheviks with the support of the Armenian Revolutionary Federation (Dashnaktsutiun) on one side and the Azerbaijani Musavat Party on another, the events led to rumours of a possible Muslim revolt on the part of Bolshevik and Dashnak forces and the establishment of the short-lived Baku Commune in April 1918. The majority of historic sources and accounts interpret the March Days in the context of civil war unrest. The clashes resulted in "interethnic bloodletting", according to Ronald Grigor Suny, with massacres and atrocities being committed by both sides.

Daylight saving time (DST), also referred to as daylight savings time, daylight time (United States and Canada), or summer time (United Kingdom, European Union, and others), is the practice of advancing clocks to (in theory) make better use of the longer daylight available during summer by having darkness fall at a later clock time. The typical implementation of DST is to adjust clocks ahead of standard time by one hour in spring or late winter, and to set clocks back by one hour in the autumn (or fall in North American English, hence the mnemonic: "spring forward and fall back"). In many countries, the part of the year when DST is observed is much longer than the part aligned to standard time. The practice of DST was first tested and widely adopted in the early 20th century, since which many countries have abandoned DST partially or entirely.

The Royal Australian Air Force (RAAF) is the principal aerial warfare force of Australia, a part of the Australian Defence Force (ADF) along with the Royal Australian Navy and the Australian Army. Constitutionally, the governor-general of Australia is the de jure commander-in-chief of the Australian Defence Force. The Royal Australian Air Force is commanded by the Chief of Air Force (CAF), who is subordinate to the Chief of the Defence Force (CDF). The CAF is also directly responsible to the Minister for Defence, with the Department of Defence administering the ADF and the Air Force. Formed in March 1921, as the Australian Air Force, through the separation of the Australian Air Corps from the Army in January 1920, which in turn amalgamated the separate aerial services of both the Army and Navy. It directly continues the traditions of the Australian Flying Corps (AFC), the aviation corps of the Army that fought in the First World War and that was formed on 22 October 1912. During its history, the Royal Australian Air Force has fought in a number of major wars, including the Second World War in Europe and the Pacific, participated in the Berlin Airlift, Korean War, Malayan Emergency, Indonesia–Malaysia Confrontation, Vietnam War, and more recently, operations in East Timor, the Iraq War and subsequent intervention, and the War in Afghanistan. The RAAF operates the majority of the ADF's fixed wing aircraft, although both the Australian Army and Royal Australian Navy also operate aircraft in various roles. The RAAF provides support across a spectrum of operations such as air superiority, precision strikes, intelligence, surveillance, and reconnaissance, air mobility, space surveillance, and humanitarian support. The RAAF has 252 aircraft, of which 108 are combat aircraft.

The Motion Picture Production Code was a set of industry guidelines for the self-censorship of content that was applied to most motion pictures released by major studios in the United States from 1934 to 1968. It is also popularly known as the Hays Code, after Will H. Hays, president of the Motion Picture Producers and Distributors of America (MPPDA) from 1922 to 1945. The code spelled out unacceptable content for motion pictures produced for a public audience in the United States, such as drugs, profanity, and sex. Under Hays's leadership, the MPPDA, later the Motion Picture Association of America (MPAA) and the Motion Picture Association (MPA), adopted the Production Code in 1930 and began rigidly enforcing it in 1934.

The 1931 Nicaragua earthquake devastated Nicaragua's capital city of Managua on 31 March 1931. It had a moment magnitude of 6.1 and a maximum MSK intensity of VI (Strong). Between 1,000 and 2,450 people were killed. A major fire started and destroyed thousands of structures, burning into the next day. At least 45,000 were left homeless and losses of $35 million were recorded.

On March 31, 1931, a Fokker F-10 belonging to Transcontinental and Western Air crashed near Bazaar, Kansas, after taking off from Kansas City Municipal Airport in Kansas City, Missouri. The scheduled flight was from Kansas City to Los Angeles, with a stopover in Wichita. On this first leg, the wooden structure of one wing failed, causing the aircraft to crash, killing all eight people on board, including Notre Dame football coach Knute Rockne. The investigation found that the wooden wing became moist over time, causing the glue connecting the wing to the fuselage to weaken, allowing the wing to separate. The crash brought about significant changes in airplane safety and the airplane industry. The death of Rockne and the crash's effect on the public perception of the safety of aircraft contributed to its cultural significance.

The Civilian Conservation Corps (CCC) was a government work relief program that ran from 1933 to 1942 in the United States for unemployed, unmarried men ages 18–25 and eventually expanded to ages 17–28, who volunteered amid widespread unemployment. The CCC was a major part of President Franklin D. Roosevelt's New Deal that supplied manual labor jobs related to the conservation and development of natural resources in rural lands owned by federal, state, and local governments. The CCC was designed to supply jobs for young men and to relieve families who had difficulty finding jobs during the Great Depression in the United States. There was a smaller counterpart program for unemployed women called the She-She-She Camps, which were championed by Eleanor Roosevelt. Robert Fechner was the first director of this agency, succeeded by James McEntee following Fechner's death. The largest enrollment at any one time was 300,000. Through the course of its nine years in operation, three million young men took part in the CCC, which provided them with shelter, clothing, and food, together with a monthly wage of $30 (equivalent to $746 in 2025), $25 of which (equivalent to $622 in 2025) had to be sent home to their families. The American public made the CCC the most popular of all the New Deal programs. Sources written at the time claimed an individual's enrollment in the CCC led to improved physical condition, heightened morale, and increased employability. The CCC also led to a greater public awareness and appreciation of the outdoors and the nation's natural resources, and the continued need for a carefully planned, comprehensive national program for the protection and development of natural resources. The CCC operated separate programs for veterans and Native Americans. Approximately 15,000 Native Americans took part in the program, helping them weather the Great Depression. By 1942, with World War II raging and the draft in effect, the need for work relief declined, and Congress voted to close the program.

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.

Nazi Germany, officially the German Reich and later the Greater German Reich, was the German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a totalitarian dictatorship. The Third Reich, meaning "Third Realm" or "Third Empire", referred to the Nazi claim that Nazi Germany was the successor to the Holy Roman Empire (800–1806) and the German Empire (1871–1918). The Third Reich, which the Nazis referred to as the Thousand-Year Reich, ended in May 1945, after 12 years, when the Allies defeated Germany and entered the capital, Berlin, ending World War II in Europe.

The Dominion of Newfoundland, or simply Newfoundland, was a British Dominion in eastern North America, today the modern Canadian province of Newfoundland and Labrador. It included the island of Newfoundland, and Labrador on the continental mainland. Newfoundland was one of the original dominions under the Balfour Declaration of 1926, and accordingly enjoyed a constitutional status equivalent to the other dominions of the time. Its dominion status was confirmed by the Statute of Westminster 1931, although the statute was not otherwise applicable to Newfoundland.

Remington Rand, Inc., was an early American business machine manufacturer, originally a typewriter manufacturer and in a later incarnation the manufacturer of the UNIVAC line of mainframe computers. Formed in 1927 following a merger, Remington Rand was a diversified conglomerate making other office equipment, electric shavers, etc. The Remington Rand Building at 315 Park Avenue South in New York City is a 20-floor skyscraper completed in 1911. After 1955, Remington Rand had a long series of mergers and acquisitions that eventually resulted in the formation of Unisys.

Territorial Assembly elections were held in French Upper Volta on 31 March 1957. The result was a victory for the Unified Democratic Party, which won 33 of the 68 seats in the Assembly.

The 1958 Canadian federal election was held to elect members of the House of Commons of Canada of the 24th Parliament of Canada on March 31, 1958, just nine months after the 23rd election. It transformed Prime Minister John Diefenbaker's minority into the largest majority government in Canadian history and the second-largest percentage of the popular vote; only Unionist Prime Minister Robert Borden’s triumph in the 1917 federal election, at 56.93 per cent, was higher. Although the Tories would surpass their 1958-seat total in the 1984 election, the 1958 result remains unmatched both in terms of percentage of seats (78.5%) and the size of the government majority over all opposition parties. Voter turnout was 79.4%, the highest percentage of eligible electors to cast a ballot in Canadian federal election history.

The 14th Dalai Lama is the current Dalai Lama, the highest spiritual leader and head of Tibetan Buddhism. He served as the resident spiritual and temporal leader of Tibet before 1959, and subsequently led the Tibetan government in exile represented by the Central Tibetan Administration in Dharamshala, India.

Olímpio Mourão Filho was a Brazilian military officer known as the author of the Cohen Plan, a forged document used to justify the Estado Novo coup in 1937, and, as head of the 4th Military Region/Infantry Division, as the precipitator of the 1964 coup d'état that installed the military dictatorship in Brazil. He reached the rank of army general and ended his career presiding over the Superior Military Court (STM) from 1967 to 1969.

The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a transcontinental country that spanned much of Eurasia from its formation in 1922 until its dissolution in 1991. It was the world's third-most populous country, the largest by area, and bordered twelve other countries. A diverse multinational state, it was organized as a federal union of national republics, with the largest and most populous being the Russian Soviet Federative Socialist Republic (SFSR). The world's flagship communist state, it was governed by the Communist Party under Marxism–Leninism, through soviet councils. The Soviet economy was also centrally planned. Its capital and largest city was Moscow.

The president of the United States (POTUS) is the head of state and head of government of the United States. The president directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces.

Explorer 1 was the first satellite launched by the United States and was part of the U.S. participation in the International Geophysical Year (IGY). The 1958 mission followed the first two satellites, both launched by the Soviet Union during the previous year, Sputnik 1 and Sputnik 2. This began a Space Race during the Cold War between the two nations.

The original Chicago, Rock Island and Pacific Railroad was an American Class I railroad. It was also known as the Rock Island Line, or, in its final years, The Rock.

Mexicana de Aviación Flight 940 was a scheduled international flight from Mexico City to Los Angeles with stopovers in Puerto Vallarta and Mazatlán. On March 31, 1986, the Boeing 727 Veracruz, registered as XA-MEM, crashed into El Carbón, a mountain in the Sierra Madre Occidental mountain range northwest of Mexico City. All 159 passengers and 8 crew members on board died in the crash. With 167 deaths, the crash of Flight 940 is the deadliest aviation disaster ever on Mexican soil, and the deadliest involving a Boeing 727.

The poll tax riots were a series of riots in British towns and cities during protests against the Community Charge, introduced by the Conservative government of Prime Minister Margaret Thatcher. The largest protest occurred in central London on Saturday 31 March 1990, shortly before the tax was due to come into force in England and Wales.

An independence referendum was held in the Republic of Georgia on 31 March 1991. It was approved by 99.5% of voters.

The Warsaw Pact (WP), formally the Treaty of Friendship, Cooperation and Mutual Assistance (TFCMA), was a collective defence treaty signed in Warsaw, Poland, between the Soviet Union and seven other Eastern Bloc socialist republics in Central and Eastern Europe in May 1955, during the Cold War. The term "Warsaw Pact" commonly refers to both the treaty itself and its resultant military alliance, the Warsaw Pact Organisation. The Warsaw Pact was the military complement to the Council for Mutual Economic Assistance (Comecon), the economic organization for the Eastern Bloc states.

USS Missouri (BB-63) is an Iowa-class battleship built for the United States Navy (USN) in the 1940s and is now a museum ship. Completed in 1944, she is the last battleship commissioned by the United States. The ship was assigned to the Pacific Theater during World War II, where she participated in the Battles of Iwo Jima and Okinawa and shelled the Japanese home islands. Her quarterdeck was the site where the Japanese Instrument of Surrender was signed, officially ending World War II.

The Treaty of Federation was a treaty signed on 31 March 1992 in Moscow between the Russian government and 86 of 89 federal subjects of Russia.

The Basic Law of the Macao Special Administrative Region of the People's Republic of China is the organic law that establishes the Macau Special Administrative Region, replacing the Organic Statute of Macau. It was adopted on 31 March 1993 by China's National People's Congress and promulgated by President Jiang Zemin; it came into effect on 20 December 1999, following the handover of Macau from Portugal to China.

Selena Quintanilla-Pérez, known mononymously as Selena, was an American singer-songwriter, fashion designer and business owner. Known as the "Queen of Tejano Music", she is known for her contributions to popular music and fashion, which made her one of the most celebrated Mexican-American entertainers of the late 20th century. Media outlets called her the "Tejano Madonna" for her clothing choices. She also ranks among the most influential Latin artists of all time and is credited for catapulting the Tejano genre into the mainstream market.

TAROM Flight 371 was a scheduled international passenger flight from Otopeni International Airport in Romania's capital Bucharest to Brussels Airport in Belgium. On 31 March 1995, the Airbus A310 operating flight 371 entered a steep turn and dive shortly after takeoff, crashing near Balotești in Romania, killing all 60 people on board. The flight was operated by TAROM, the flag carrier of Romania.

The Anbar campaign consisted of fighting between the United States military, together with Iraqi security forces, and Sunni insurgents in the western Iraqi governorate of Al Anbar. The Iraq War lasted from 2003 to 2011, but the majority of the fighting and counterinsurgency campaign in Anbar took place between April 2004 and September 2007. Although the fighting initially featured heavy urban warfare primarily between insurgents and U.S. Marines, insurgents in later years focused on ambushing the American and Iraqi security forces with improvised explosive devices (IEDs), large scale attacks on combat outposts, and car bombings. Almost 9,000 Iraqis and 1,335 Americans were killed in the campaign, many in the Euphrates River Valley and the Sunni Triangle around the cities of Fallujah and Ramadi.

A dwarf planet is a small planetary-mass object that is in direct orbit around the Sun, massive enough to be gravitationally rounded, but insufficient to achieve orbital dominance like the eight classical planets of the Solar System. The prototypical dwarf planet is Pluto, which for decades was regarded as a planet before the "dwarf" concept was adopted in 2006. Many planetary geologists consider dwarf planets and planetary-mass moons to be planets, but since 2006 the IAU and many astronomers have excluded them from the roster of planets.

The National Aeronautics and Space Administration is an independent agency of the U.S. federal government responsible for the United States' civil space program, as well as research in aeronautics and space. Headquartered in Washington, D.C., NASA operates ten field centers across the US and is organized into three mission directorates: Human Spaceflight, Research and Technology, and Science. Established in 1958 amid the Space Race, NASA succeeded the National Advisory Committee for Aeronautics (NACA) to give the US space program a distinct civilian orientation focused on peaceful applications. Since then, it has led most American spaceflight programs, including Project Mercury, Project Gemini, the Apollo program, Skylab, the Space Shuttle, the International Space Station (ISS), and the ongoing multi-national Artemis program.

The 2018 Armenian Revolution, most commonly known in Armenia as #MerzhirSerzhin, was a series of anti-government protests in Armenia from April to May 2018 staged by various political and civil groups led by a member of the Armenian parliament – Nikol Pashinyan. Protests and marches took place initially in response to Serzh Sargsyan's third consecutive term as the most powerful figure in the government of Armenia, later broadening against the ruling Republican Party, who were in power since 1999. Pashinyan declared it a Velvet Revolution.

A widespread, deadly, and historic tornado outbreak affected large portions of the Midwestern, Southern and Eastern United States on March 31 and April 1, 2023, the result of an extratropical cyclone that also produced blizzard conditions in the Upper Midwest. The Storm Prediction Center (SPC) issued a rare high risk for severe weather in two areas of the Mississippi Valley on March 31, the first high risk issuance since March 25, 2021. Approximately 28 million people were placed under tornado watches, including multiple PDS tornado watches, from the evening of March 31 through the overnight hours into the morning of April 1. This included the Little Rock, St. Louis, Chicago, and Memphis metropolitan areas, all of which were hit by multiple rounds of severe squall lines and supercell thunderstorms that produced damaging winds, large hail, and strong to violent tornadoes. EF3 tornadoes in Arkansas, Tennessee, and Illinois prompted the issuance of tornado emergencies and multiple mass casualty incidents were declared for some of the hardest hit areas. One of these tornadoes was a high-end EF3 tornado that passed through the northern Little Rock metro, causing extensive damage and dozens of injuries. The strongest tornado was a low-end EF4 tornado that swept away homes on the west side of Keota, Iowa. The Apollo Theatre in Belvidere, Illinois collapsed during a concert due to an EF1 tornado, injuring up to 40 concertgoers and killing one. Severe and tornadic weather also affected the Northeastern United States in the afternoon and evening of April 1, including a rare EF3 tornado that caused a death in Sussex County, Delaware. At certain points of the outbreak, over 20 simultaneous tornado warnings were active, with a total of 175 tornado warnings issued on March 31 with an additional 51 issued on April 1.