March 15

Roman dictator Julius Caesar is assassinated by a group of senators on the Ides of March, a pivotal moment in the fall of the Roman Republic.

A group of Roman senators, including Brutus and Cassius, stabbed Julius Caesar to death in the Theatre of Pompey, fearing his accumulating power threatened the Republic. Rather than restoring republican governance, the assassination triggered years of civil war that ultimately led to the rise of Caesar's heir, Augustus, as emperor.

Roman dictator Julius Caesar is stabbed to death by a group of senators, including Marcus Junius Brutus, in the Theatre of Pompey in Rome.

The conspirators, who styled themselves the Liberatores, believed Caesar's growing personal power threatened the Roman Republic and hoped his death would restore traditional senatorial rule. Instead, the assassination triggered over a decade of civil war that ended the Republic entirely, culminating in the rise of Caesar's adopted heir Octavian as the first Roman emperor, Augustus. The date, the Ides of March, became forever associated with betrayal.

King Charles II issues the Royal Declaration of Indulgence, suspending penal laws against Catholics and Protestant nonconformists in England.

The declaration used the monarch's claimed power to suspend laws passed by Parliament, provoking a fierce backlash from MPs who saw it as an assault on parliamentary authority and a step toward greater royal power. Parliament forced Charles to withdraw the declaration the following year and instead passed the Test Act, which required officeholders to take Anglican communion, deepening tensions that would resurface under his Catholic successor, James II.

British forces under General Lord Cornwallis defeat an American army led by Nathanael Greene at the Battle of Guilford Court House in North Carolina.

Although Cornwallis held the field, his heavily outnumbered force suffered such severe casualties that the victory proved pyrrhic. The battle so weakened his army that he abandoned the Carolinas campaign and marched north into Virginia, where he later fortified Yorktown, setting the stage for his surrender to Franco-American forces later that year that effectively ended the American Revolutionary War.

Maine is admitted as the 23rd U.S. state, part of the sectional balance struck by the Missouri Compromise.

Maine was admitted to the Union as a free state as part of the Missouri Compromise, which simultaneously allowed Missouri to enter as a slave state to preserve the sectional balance in the Senate. The arrangement temporarily eased tensions over slavery's expansion but merely postponed the deeper national reckoning.

The first official Test cricket match begins between Australia and England at the Melbourne Cricket Ground.

The match, won narrowly by Australia by 45 runs, launched what became the oldest and most storied rivalry in international cricket. Test matches between the two countries later gave rise to the Ashes series in 1882, and the five-day format between national teams established at Melbourne became the sport's most prestigious and enduring form of international competition.

British Indian forces launch a military expedition into Tibet, beginning the Anglo-Tibetan War.

The campaign arose from a border dispute in Sikkim and British anxiety over Tibet's ties to Russia during the 'Great Game' rivalry between the two empires in Central Asia. British and Indian troops, better armed and organised, defeated Tibetan forces at Lungtur and forced a settlement recognising British control over Sikkim, foreshadowing the larger British expedition into Tibet led by Francis Younghusband in 1903-04.

Tsar Nicholas II abdicates the Russian throne, ending the 304-year Romanov dynasty.

Facing mutinying troops and losing the support of his generals amid the February Revolution, Tsar Nicholas II abdicated the throne, ending over three centuries of Romanov rule. His abdication led to a provisional government that itself was overthrown by the Bolsheviks later that year, and the former tsar's family was executed in 1918.

Tsar Nicholas II abdicates the Russian throne amid the February Revolution, ending three centuries of Romanov rule.

Mounting military failures in the First World War, food shortages, and widespread unrest had eroded support for the monarchy, and even Nicholas's own generals urged him to step down. His abdication brought a provisional government to power, but that government's own instability paved the way for the Bolshevik seizure of power later that year in the October Revolution.

Fuad I becomes King of Egypt after the country gains nominal independence from Britain.

Britain granted Egypt nominal independence while retaining control over defense, foreign affairs, and the Suez Canal, and Sultan Fuad I took the title of King. The arrangement left considerable British influence intact, fueling continued nationalist agitation that eventually led to fuller independence decades later.

The first Women's Boat Race is rowed between crews from Oxford and Cambridge universities.

The event was staged separately from, and with far less fanfare than, the famous men's Boat Race, which had been contested annually on the Thames since 1829. Early women's races were judged on style rather than raced side by side, reflecting the limited opportunities for women's competitive rowing at the time. The event slowly grew in stature over the following decades before eventually being raced on the same course and day as the men's event.

Nazi Germany occupies the remainder of Czechoslovakia, violating the earlier Munich Agreement.

German troops occupied the remaining Czech territories of Bohemia and Moravia after Hitler summoned Czechoslovak President Emil Hacha to Berlin and coerced his capitulation, violating the earlier Munich Agreement's guarantees. The move exposed the futility of Western appeasement and pushed Europe closer to full-scale war.

Iran's parliament votes to nationalize the country's oil industry, previously controlled by a British company.

Iran's parliament voted to nationalize the Anglo-Iranian Oil Company's holdings, asserting control over the country's vast petroleum resources previously dominated by British interests. The move, championed by Prime Minister Mohammad Mossadegh, led to a British-led boycott and eventually a 1953 coup that removed him from power.

Iran's parliament votes to nationalize the country's oil industry, seizing the assets of the British-controlled Anglo-Iranian Oil Company.

The move, driven by Prime Minister Mohammad Mosaddegh, ended decades of British control over Iranian oil production that dated back to a 1901 concession. Britain responded with a global boycott of Iranian oil and diplomatic pressure, and the crisis culminated in 1953 when a British- and American-backed coup removed Mosaddegh from power. The Anglo-Iranian Oil Company was later renamed British Petroleum.

South Africa announces it will withdraw from the Commonwealth of Nations after facing criticism of its apartheid policies.

The announcement came after other Commonwealth leaders, at a conference in London, made clear that South Africa's application to remain a member as a republic would be opposed unless it abandoned apartheid. Prime Minister Hendrik Verwoerd withdrew the application rather than face rejection. South Africa did not rejoin the Commonwealth until 1994, following the end of apartheid and the election of Nelson Mandela.

President Lyndon B. Johnson addresses Congress advocating for the Voting Rights Act amid the Selma civil rights crisis.

President Lyndon B. Johnson addressed a joint session of Congress, invoking the phrase "we shall overcome" and calling for passage of comprehensive voting rights legislation in the wake of the violent Selma marches. Congress passed the Voting Rights Act months later, outlawing discriminatory voting practices across the South.

A treaty granting full sovereignty to a reunified Germany comes into effect, formally ending postwar Allied occupation.

A treaty between the two German states and the four World War II Allied powers came into force, granting a reunified Germany full sovereignty and ending the residual occupation rights the Allies had held since 1945. The agreement completed the formal process of German reunification that began with the fall of the Berlin Wall.

The Treaty on the Final Settlement with Respect to Germany comes into force, restoring full sovereignty to a reunified Germany.

Signed the previous September by the two German states and the four wartime Allied powers, Britain, France, the United States, and the Soviet Union, the treaty formally ended the post-war occupation rights those powers had held since 1945. Its entry into force removed the last legal restrictions on German sovereignty stemming from the Second World War, completing the process of German reunification.

Mass protests begin in Syria, part of the wider Arab Spring, eventually escalating into a prolonged civil war.

Protests against Bashar al-Assad's government began in the southern Syrian city of Deraa following the detention and torture of teenagers who had painted revolutionary graffiti. The demonstrations, part of the broader Arab Spring, escalated into a devastating civil war that continued for over a decade.

A gunman kills 51 people at two mosques in Christchurch, New Zealand, in a livestreamed terrorist attack.

A gunman opened fire on worshippers at two mosques in Christchurch, New Zealand, killing 51 people in an attack he livestreamed online. The massacre, motivated by white supremacist ideology, prompted New Zealand to swiftly enact sweeping gun control legislation within weeks.